diff --git a/Dockerfile b/Dockerfile
index 92c8bae6b..4d990737b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,5 @@
-# Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 
 ############################################################################
 #
diff --git a/Dockerfile.base b/Dockerfile.base
index bf675921c..7f42845f2 100644
--- a/Dockerfile.base
+++ b/Dockerfile.base
@@ -1,6 +1,5 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 
 FROM alpine:3.16
 RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables
diff --git a/atomicfile/atomicfile.go b/atomicfile/atomicfile.go
index 8fa2f6ad1..b63955a92 100644
--- a/atomicfile/atomicfile.go
+++ b/atomicfile/atomicfile.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2019 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package atomicfile contains code related to writing to filesystems
 // atomically.
diff --git a/chirp/chirp.go b/chirp/chirp.go
index 58c84fb1c..965387722 100644
--- a/chirp/chirp.go
+++ b/chirp/chirp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package chirp implements a client to communicate with the BIRD Internet
 // Routing Daemon.
diff --git a/chirp/chirp_test.go b/chirp/chirp_test.go
index eff4d4721..2549c163f 100644
--- a/chirp/chirp_test.go
+++ b/chirp/chirp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 package chirp
 
 import (
diff --git a/client/tailscale/acl.go b/client/tailscale/acl.go
index 9ecf7d373..4266febac 100644
--- a/client/tailscale/acl.go
+++ b/client/tailscale/acl.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/apitype/apitype.go b/client/tailscale/apitype/apitype.go
index b522734f1..fbb8a5b43 100644
--- a/client/tailscale/apitype/apitype.go
+++ b/client/tailscale/apitype/apitype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package apitype contains types for the Tailscale LocalAPI and control plane API.
 package apitype
diff --git a/client/tailscale/apitype/controltype.go b/client/tailscale/apitype/controltype.go
index b6754f527..928328862 100644
--- a/client/tailscale/apitype/controltype.go
+++ b/client/tailscale/apitype/controltype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package apitype
 
diff --git a/client/tailscale/devices.go b/client/tailscale/devices.go
index bba6985d4..90cd0183e 100644
--- a/client/tailscale/devices.go
+++ b/client/tailscale/devices.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/dns.go b/client/tailscale/dns.go
index 51f8dcfcc..1f1a8ea1c 100644
--- a/client/tailscale/dns.go
+++ b/client/tailscale/dns.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/example/servetls/servetls.go b/client/tailscale/example/servetls/servetls.go
index bfa2cc9ed..f48e90d16 100644
--- a/client/tailscale/example/servetls/servetls.go
+++ b/client/tailscale/example/servetls/servetls.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The servetls program shows how to run an HTTPS server
 // using a Tailscale cert via LetsEncrypt.
diff --git a/client/tailscale/keys.go b/client/tailscale/keys.go
index 571c57c78..05a29be50 100644
--- a/client/tailscale/keys.go
+++ b/client/tailscale/keys.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailscale
 
diff --git a/client/tailscale/localclient.go b/client/tailscale/localclient.go
index 4d38e7a15..89a57bc56 100644
--- a/client/tailscale/localclient.go
+++ b/client/tailscale/localclient.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/localclient_test.go b/client/tailscale/localclient_test.go
index 9121b1acf..ebcd1bab6 100644
--- a/client/tailscale/localclient_test.go
+++ b/client/tailscale/localclient_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/required_version.go b/client/tailscale/required_version.go
index 1f255a8c3..21a539e23 100644
--- a/client/tailscale/required_version.go
+++ b/client/tailscale/required_version.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !go1.19
 
diff --git a/client/tailscale/routes.go b/client/tailscale/routes.go
index fcf6d5227..5912fc46c 100644
--- a/client/tailscale/routes.go
+++ b/client/tailscale/routes.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/tailnet.go b/client/tailscale/tailnet.go
index 83cda5b30..2539e7f23 100644
--- a/client/tailscale/tailnet.go
+++ b/client/tailscale/tailnet.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/client/tailscale/tailscale.go b/client/tailscale/tailscale.go
index 275aeafb8..894561965 100644
--- a/client/tailscale/tailscale.go
+++ b/client/tailscale/tailscale.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/addlicense/main.go b/cmd/addlicense/main.go
index 0ca9dc5de..856bc8b86 100644
--- a/cmd/addlicense/main.go
+++ b/cmd/addlicense/main.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Program addlicense adds a license header to a file.
 // It is intended for use with 'go generate',
diff --git a/cmd/cloner/cloner.go b/cmd/cloner/cloner.go
index 8f886f0a6..37c8a30a5 100644
--- a/cmd/cloner/cloner.go
+++ b/cmd/cloner/cloner.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Cloner is a tool to automate the creation of a Clone method.
 //
diff --git a/cmd/containerboot/kube.go b/cmd/containerboot/kube.go
index 1e142ae73..909a1e393 100644
--- a/cmd/containerboot/kube.go
+++ b/cmd/containerboot/kube.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/cmd/containerboot/main.go b/cmd/containerboot/main.go
index 73ca4a3c2..b074d9fb3 100644
--- a/cmd/containerboot/main.go
+++ b/cmd/containerboot/main.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/cmd/containerboot/main_test.go b/cmd/containerboot/main_test.go
index b789130ae..8f4c22302 100644
--- a/cmd/containerboot/main_test.go
+++ b/cmd/containerboot/main_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/cmd/derper/bootstrap_dns.go b/cmd/derper/bootstrap_dns.go
index f09e66653..134cfad93 100644
--- a/cmd/derper/bootstrap_dns.go
+++ b/cmd/derper/bootstrap_dns.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/derper/bootstrap_dns_test.go b/cmd/derper/bootstrap_dns_test.go
index ecc73d331..70d3c8678 100644
--- a/cmd/derper/bootstrap_dns_test.go
+++ b/cmd/derper/bootstrap_dns_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/derper/cert.go b/cmd/derper/cert.go
index 2388131f3..1fab755a0 100644
--- a/cmd/derper/cert.go
+++ b/cmd/derper/cert.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/derper/derper.go b/cmd/derper/derper.go
index 6b1b5e1f6..48efaba40 100644
--- a/cmd/derper/derper.go
+++ b/cmd/derper/derper.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The derper binary is a simple DERP server.
 package main // import "tailscale.com/cmd/derper"
diff --git a/cmd/derper/derper_test.go b/cmd/derper/derper_test.go
index ddd718c2d..b70d18d1b 100644
--- a/cmd/derper/derper_test.go
+++ b/cmd/derper/derper_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/derper/mesh.go b/cmd/derper/mesh.go
index a6e6be3f4..8744f1055 100644
--- a/cmd/derper/mesh.go
+++ b/cmd/derper/mesh.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/derper/websocket.go b/cmd/derper/websocket.go
index 68b0ce940..3f0c4bd0e 100644
--- a/cmd/derper/websocket.go
+++ b/cmd/derper/websocket.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/derpprobe/derpprobe.go b/cmd/derpprobe/derpprobe.go
index 4b685f74a..f2c156bfb 100644
--- a/cmd/derpprobe/derpprobe.go
+++ b/cmd/derpprobe/derpprobe.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The derpprobe binary probes derpers.
 package main // import "tailscale.com/cmd/derper/derpprobe"
diff --git a/cmd/gitops-pusher/cache.go b/cmd/gitops-pusher/cache.go
index b3646822e..6792e5e63 100644
--- a/cmd/gitops-pusher/cache.go
+++ b/cmd/gitops-pusher/cache.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/gitops-pusher/gitops-pusher.go b/cmd/gitops-pusher/gitops-pusher.go
index caf1cf9db..9cfdea604 100644
--- a/cmd/gitops-pusher/gitops-pusher.go
+++ b/cmd/gitops-pusher/gitops-pusher.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Command gitops-pusher allows users to use a GitOps flow for managing Tailscale ACLs.
 //
diff --git a/cmd/hello/hello.go b/cmd/hello/hello.go
index 9ea1bd75b..de864878e 100644
--- a/cmd/hello/hello.go
+++ b/cmd/hello/hello.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The hello binary runs hello.ts.net.
 package main // import "tailscale.com/cmd/hello"
diff --git a/cmd/k8s-operator/manifests/operator.yaml b/cmd/k8s-operator/manifests/operator.yaml
index 76f3bb69d..ca9bd4785 100644
--- a/cmd/k8s-operator/manifests/operator.yaml
+++ b/cmd/k8s-operator/manifests/operator.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 
 apiVersion: v1
 kind: Namespace
diff --git a/cmd/k8s-operator/operator.go b/cmd/k8s-operator/operator.go
index 0e8e71e42..3ef70539c 100644
--- a/cmd/k8s-operator/operator.go
+++ b/cmd/k8s-operator/operator.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // tailscale-operator provides a way to expose services running in a Kubernetes
 // cluster to your Tailnet.
diff --git a/cmd/k8s-operator/operator_test.go b/cmd/k8s-operator/operator_test.go
index 3ee322462..b3206e0dc 100644
--- a/cmd/k8s-operator/operator_test.go
+++ b/cmd/k8s-operator/operator_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/mkmanifest/main.go b/cmd/mkmanifest/main.go
index 916774a00..7209fe3b7 100644
--- a/cmd/mkmanifest/main.go
+++ b/cmd/mkmanifest/main.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The mkmanifest command is a simple helper utility to create a '.syso' file
 // that contains a Windows manifest file.
diff --git a/cmd/mkpkg/main.go b/cmd/mkpkg/main.go
index 6c4f1b612..cae8dac0a 100644
--- a/cmd/mkpkg/main.go
+++ b/cmd/mkpkg/main.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // mkpkg builds the Tailscale rpm and deb packages.
 package main
diff --git a/cmd/nardump/nardump.go b/cmd/nardump/nardump.go
index 61838dfe8..05be7b65a 100644
--- a/cmd/nardump/nardump.go
+++ b/cmd/nardump/nardump.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // nardump is like nix-store --dump, but in Go, writing a NAR
 // file (tar-like, but focused on being reproducible) to stdout
diff --git a/cmd/netlogfmt/main.go b/cmd/netlogfmt/main.go
index 0ee3e260d..7728c94a0 100644
--- a/cmd/netlogfmt/main.go
+++ b/cmd/netlogfmt/main.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // netlogfmt parses a stream of JSON log messages from stdin and
 // formats the network traffic logs produced by "tailscale.com/wgengine/netlog"
diff --git a/cmd/nginx-auth/nginx-auth.go b/cmd/nginx-auth/nginx-auth.go
index 53dcb9596..796d794c0 100644
--- a/cmd/nginx-auth/nginx-auth.go
+++ b/cmd/nginx-auth/nginx-auth.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/cmd/pgproxy/pgproxy.go b/cmd/pgproxy/pgproxy.go
index e3fa25954..54f80a674 100644
--- a/cmd/pgproxy/pgproxy.go
+++ b/cmd/pgproxy/pgproxy.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The pgproxy server is a proxy for the Postgres wire protocol.
 package main
diff --git a/cmd/printdep/printdep.go b/cmd/printdep/printdep.go
index 0cf6ff99f..9597e0832 100644
--- a/cmd/printdep/printdep.go
+++ b/cmd/printdep/printdep.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The printdep command is a build system tool for printing out information
 // about dependencies.
diff --git a/cmd/proxy-to-grafana/proxy-to-grafana.go b/cmd/proxy-to-grafana/proxy-to-grafana.go
index 56c566e75..33800d583 100644
--- a/cmd/proxy-to-grafana/proxy-to-grafana.go
+++ b/cmd/proxy-to-grafana/proxy-to-grafana.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // proxy-to-grafana is a reverse proxy which identifies users based on their
 // originating Tailscale identity and maps them to corresponding Grafana
diff --git a/cmd/speedtest/speedtest.go b/cmd/speedtest/speedtest.go
index 33646a44f..9a457ed6c 100644
--- a/cmd/speedtest/speedtest.go
+++ b/cmd/speedtest/speedtest.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Program speedtest provides the speedtest command. The reason to keep it separate from
 // the normal tailscale cli is because it is not yet ready to go in the tailscale binary.
diff --git a/cmd/ssh-auth-none-demo/ssh-auth-none-demo.go b/cmd/ssh-auth-none-demo/ssh-auth-none-demo.go
index f92c80ae4..82b436d5c 100644
--- a/cmd/ssh-auth-none-demo/ssh-auth-none-demo.go
+++ b/cmd/ssh-auth-none-demo/ssh-auth-none-demo.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // ssh-auth-none-demo is a demo SSH server that's meant to run on the
 // public internet (at 188.166.70.128 port 2222) and
diff --git a/cmd/stunc/stunc.go b/cmd/stunc/stunc.go
index 34cc4f2e5..f140ede19 100644
--- a/cmd/stunc/stunc.go
+++ b/cmd/stunc/stunc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Command stunc makes a STUN request to a STUN server and prints the result.
 package main
diff --git a/cmd/sync-containers/main.go b/cmd/sync-containers/main.go
index c038e5754..f58d8e0ea 100644
--- a/cmd/sync-containers/main.go
+++ b/cmd/sync-containers/main.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The sync-containers command synchronizes container image tags from one
 // registry to another.
diff --git a/cmd/tailscale/cli/bugreport.go b/cmd/tailscale/cli/bugreport.go
index d0c6ff560..1c2640c2d 100644
--- a/cmd/tailscale/cli/bugreport.go
+++ b/cmd/tailscale/cli/bugreport.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/cert.go b/cmd/tailscale/cli/cert.go
index f665e9b5d..eeafa2b33 100644
--- a/cmd/tailscale/cli/cert.go
+++ b/cmd/tailscale/cli/cert.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/cli.go b/cmd/tailscale/cli/cli.go
index ec32ad969..786eac60e 100644
--- a/cmd/tailscale/cli/cli.go
+++ b/cmd/tailscale/cli/cli.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package cli contains the cmd/tailscale CLI code in a package that can be included
 // in other wrapper binaries such as the Mac and Windows clients.
diff --git a/cmd/tailscale/cli/cli_test.go b/cmd/tailscale/cli/cli_test.go
index 1e2f7099f..623cb2c34 100644
--- a/cmd/tailscale/cli/cli_test.go
+++ b/cmd/tailscale/cli/cli_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/configure-host.go b/cmd/tailscale/cli/configure-host.go
index a68d3eb07..7aeaa477a 100644
--- a/cmd/tailscale/cli/configure-host.go
+++ b/cmd/tailscale/cli/configure-host.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/debug.go b/cmd/tailscale/cli/debug.go
index f6e91b8f4..5f8aac444 100644
--- a/cmd/tailscale/cli/debug.go
+++ b/cmd/tailscale/cli/debug.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/diag.go b/cmd/tailscale/cli/diag.go
index 4df526de9..5ed6ba92b 100644
--- a/cmd/tailscale/cli/diag.go
+++ b/cmd/tailscale/cli/diag.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || windows || darwin
 
diff --git a/cmd/tailscale/cli/diag_other.go b/cmd/tailscale/cli/diag_other.go
index d8deb6390..ece10cc79 100644
--- a/cmd/tailscale/cli/diag_other.go
+++ b/cmd/tailscale/cli/diag_other.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux && !windows && !darwin
 
diff --git a/cmd/tailscale/cli/down.go b/cmd/tailscale/cli/down.go
index 2105f76b7..e2b5b97f6 100644
--- a/cmd/tailscale/cli/down.go
+++ b/cmd/tailscale/cli/down.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/file.go b/cmd/tailscale/cli/file.go
index 19da6ab39..fc1581553 100644
--- a/cmd/tailscale/cli/file.go
+++ b/cmd/tailscale/cli/file.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/id-token.go b/cmd/tailscale/cli/id-token.go
index f5a42ac47..13d186b7c 100644
--- a/cmd/tailscale/cli/id-token.go
+++ b/cmd/tailscale/cli/id-token.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/ip.go b/cmd/tailscale/cli/ip.go
index 53790aaa4..ea103c5b7 100644
--- a/cmd/tailscale/cli/ip.go
+++ b/cmd/tailscale/cli/ip.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/licenses.go b/cmd/tailscale/cli/licenses.go
index 65ac41aa1..3183b5809 100644
--- a/cmd/tailscale/cli/licenses.go
+++ b/cmd/tailscale/cli/licenses.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/login.go b/cmd/tailscale/cli/login.go
index d5bf20dbe..f2f3913a1 100644
--- a/cmd/tailscale/cli/login.go
+++ b/cmd/tailscale/cli/login.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/logout.go b/cmd/tailscale/cli/logout.go
index 0bce01fda..0e77844cd 100644
--- a/cmd/tailscale/cli/logout.go
+++ b/cmd/tailscale/cli/logout.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/nc.go b/cmd/tailscale/cli/nc.go
index 1f9edb185..e0cef8ccd 100644
--- a/cmd/tailscale/cli/nc.go
+++ b/cmd/tailscale/cli/nc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/netcheck.go b/cmd/tailscale/cli/netcheck.go
index 794b8800d..9023362d5 100644
--- a/cmd/tailscale/cli/netcheck.go
+++ b/cmd/tailscale/cli/netcheck.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/network-lock.go b/cmd/tailscale/cli/network-lock.go
index 282c668fc..053aff352 100644
--- a/cmd/tailscale/cli/network-lock.go
+++ b/cmd/tailscale/cli/network-lock.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/ping.go b/cmd/tailscale/cli/ping.go
index de4970d89..e781dd7b6 100644
--- a/cmd/tailscale/cli/ping.go
+++ b/cmd/tailscale/cli/ping.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/risks.go b/cmd/tailscale/cli/risks.go
index 763727f04..c495da171 100644
--- a/cmd/tailscale/cli/risks.go
+++ b/cmd/tailscale/cli/risks.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/serve.go b/cmd/tailscale/cli/serve.go
index 7b1be20cd..01ddd7372 100644
--- a/cmd/tailscale/cli/serve.go
+++ b/cmd/tailscale/cli/serve.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/serve_test.go b/cmd/tailscale/cli/serve_test.go
index d4aec3708..13795bde9 100644
--- a/cmd/tailscale/cli/serve_test.go
+++ b/cmd/tailscale/cli/serve_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/set.go b/cmd/tailscale/cli/set.go
index 397f99c58..5ed2fe284 100644
--- a/cmd/tailscale/cli/set.go
+++ b/cmd/tailscale/cli/set.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/set_test.go b/cmd/tailscale/cli/set_test.go
index d74f0cc43..15305c3ce 100644
--- a/cmd/tailscale/cli/set_test.go
+++ b/cmd/tailscale/cli/set_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/ssh.go b/cmd/tailscale/cli/ssh.go
index 579265dd5..4ba2b3d42 100644
--- a/cmd/tailscale/cli/ssh.go
+++ b/cmd/tailscale/cli/ssh.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/ssh_exec.go b/cmd/tailscale/cli/ssh_exec.go
index 67817bf40..10e52903d 100644
--- a/cmd/tailscale/cli/ssh_exec.go
+++ b/cmd/tailscale/cli/ssh_exec.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js && !windows
 
diff --git a/cmd/tailscale/cli/ssh_exec_js.go b/cmd/tailscale/cli/ssh_exec_js.go
index 3dbbea6a2..40effc7ca 100644
--- a/cmd/tailscale/cli/ssh_exec_js.go
+++ b/cmd/tailscale/cli/ssh_exec_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/ssh_exec_windows.go b/cmd/tailscale/cli/ssh_exec_windows.go
index 8a67a20f9..e249afe66 100644
--- a/cmd/tailscale/cli/ssh_exec_windows.go
+++ b/cmd/tailscale/cli/ssh_exec_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/ssh_unix.go b/cmd/tailscale/cli/ssh_unix.go
index cb3c61a61..efc3472a3 100644
--- a/cmd/tailscale/cli/ssh_unix.go
+++ b/cmd/tailscale/cli/ssh_unix.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js && !windows
 
diff --git a/cmd/tailscale/cli/status.go b/cmd/tailscale/cli/status.go
index c6e40ba84..87eb6151e 100644
--- a/cmd/tailscale/cli/status.go
+++ b/cmd/tailscale/cli/status.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/switch.go b/cmd/tailscale/cli/switch.go
index 3419b27a3..ffbf552a9 100644
--- a/cmd/tailscale/cli/switch.go
+++ b/cmd/tailscale/cli/switch.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/up.go b/cmd/tailscale/cli/up.go
index 1586b608e..0cbd80e8e 100644
--- a/cmd/tailscale/cli/up.go
+++ b/cmd/tailscale/cli/up.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/update.go b/cmd/tailscale/cli/update.go
index 970d042b6..8f332b922 100644
--- a/cmd/tailscale/cli/update.go
+++ b/cmd/tailscale/cli/update.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/update_test.go b/cmd/tailscale/cli/update_test.go
index 656a295f3..434188274 100644
--- a/cmd/tailscale/cli/update_test.go
+++ b/cmd/tailscale/cli/update_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/update_windows.go b/cmd/tailscale/cli/update_windows.go
index 2cda75dd2..971926425 100644
--- a/cmd/tailscale/cli/update_windows.go
+++ b/cmd/tailscale/cli/update_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Windows-specific stuff that can't go in update.go because it needs
 // x/sys/windows.
diff --git a/cmd/tailscale/cli/version.go b/cmd/tailscale/cli/version.go
index fdbe66128..eed5bec63 100644
--- a/cmd/tailscale/cli/version.go
+++ b/cmd/tailscale/cli/version.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/web.go b/cmd/tailscale/cli/web.go
index 81f8b13e4..68e63ddf9 100644
--- a/cmd/tailscale/cli/web.go
+++ b/cmd/tailscale/cli/web.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/cli/web_test.go b/cmd/tailscale/cli/web_test.go
index 5a48625b8..6c44c27d2 100644
--- a/cmd/tailscale/cli/web_test.go
+++ b/cmd/tailscale/cli/web_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cli
 
diff --git a/cmd/tailscale/generate.go b/cmd/tailscale/generate.go
index e068c1390..377ccd5e9 100644
--- a/cmd/tailscale/generate.go
+++ b/cmd/tailscale/generate.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tailscale/tailscale.go b/cmd/tailscale/tailscale.go
index c69c86f64..f6adb6c19 100644
--- a/cmd/tailscale/tailscale.go
+++ b/cmd/tailscale/tailscale.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The tailscale command is the Tailscale command-line client. It interacts
 // with the tailscaled node agent.
diff --git a/cmd/tailscaled/childproc/childproc.go b/cmd/tailscaled/childproc/childproc.go
index 3fedd9a40..cc83a06c6 100644
--- a/cmd/tailscaled/childproc/childproc.go
+++ b/cmd/tailscaled/childproc/childproc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package childproc allows other packages to register "tailscaled be-child"
 // child process hook code. This avoids duplicating build tags in the
diff --git a/cmd/tailscaled/debug.go b/cmd/tailscaled/debug.go
index fddc31e4a..33b28d6e6 100644
--- a/cmd/tailscaled/debug.go
+++ b/cmd/tailscaled/debug.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/generate.go b/cmd/tailscaled/generate.go
index e068c1390..377ccd5e9 100644
--- a/cmd/tailscaled/generate.go
+++ b/cmd/tailscaled/generate.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tailscaled/install_darwin.go b/cmd/tailscaled/install_darwin.go
index 5544d8671..05e5eaed8 100644
--- a/cmd/tailscaled/install_darwin.go
+++ b/cmd/tailscaled/install_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/install_windows.go b/cmd/tailscaled/install_windows.go
index 0331fe135..c36418642 100644
--- a/cmd/tailscaled/install_windows.go
+++ b/cmd/tailscaled/install_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/proxy.go b/cmd/tailscaled/proxy.go
index 428a44dca..a91c62bfa 100644
--- a/cmd/tailscaled/proxy.go
+++ b/cmd/tailscaled/proxy.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/required_version.go b/cmd/tailscaled/required_version.go
index ba077d4fb..17be5ab8b 100644
--- a/cmd/tailscaled/required_version.go
+++ b/cmd/tailscaled/required_version.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !go1.19
 
diff --git a/cmd/tailscaled/ssh.go b/cmd/tailscaled/ssh.go
index b85863915..f7b0b367e 100644
--- a/cmd/tailscaled/ssh.go
+++ b/cmd/tailscaled/ssh.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || darwin || freebsd || openbsd
 
diff --git a/cmd/tailscaled/taildrop.go b/cmd/tailscaled/taildrop.go
index 8c521bf87..71be089db 100644
--- a/cmd/tailscaled/taildrop.go
+++ b/cmd/tailscaled/taildrop.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/tailscaled.go b/cmd/tailscaled/tailscaled.go
index 0fe0567c5..96b28ea1d 100644
--- a/cmd/tailscaled/tailscaled.go
+++ b/cmd/tailscaled/tailscaled.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/tailscaled_bird.go b/cmd/tailscaled/tailscaled_bird.go
index eb7753c2d..c76f77bec 100644
--- a/cmd/tailscaled/tailscaled_bird.go
+++ b/cmd/tailscaled/tailscaled_bird.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19 && (linux || darwin || freebsd || openbsd) && !ts_omit_bird
 
diff --git a/cmd/tailscaled/tailscaled_notwindows.go b/cmd/tailscaled/tailscaled_notwindows.go
index 1dedc5f2e..d5361cf28 100644
--- a/cmd/tailscaled/tailscaled_notwindows.go
+++ b/cmd/tailscaled/tailscaled_notwindows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && go1.19
 
diff --git a/cmd/tailscaled/tailscaled_test.go b/cmd/tailscaled/tailscaled_test.go
index 1bba6bf2b..0c14a755a 100644
--- a/cmd/tailscaled/tailscaled_test.go
+++ b/cmd/tailscaled/tailscaled_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main // import "tailscale.com/cmd/tailscaled"
 
diff --git a/cmd/tailscaled/tailscaled_windows.go b/cmd/tailscaled/tailscaled_windows.go
index dd7b07642..8bea3eb39 100644
--- a/cmd/tailscaled/tailscaled_windows.go
+++ b/cmd/tailscaled/tailscaled_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.19
 
diff --git a/cmd/tailscaled/with_cli.go b/cmd/tailscaled/with_cli.go
index b55a0d289..a8554eb8c 100644
--- a/cmd/tailscaled/with_cli.go
+++ b/cmd/tailscaled/with_cli.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ts_include_cli
 
diff --git a/cmd/testcontrol/testcontrol.go b/cmd/testcontrol/testcontrol.go
index f4c1534b9..54e21735b 100644
--- a/cmd/testcontrol/testcontrol.go
+++ b/cmd/testcontrol/testcontrol.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Program testcontrol runs a simple test control server.
 package main
diff --git a/cmd/testwrapper/flakytest/flakytest.go b/cmd/testwrapper/flakytest/flakytest.go
index 2e0983d4a..9c8d12869 100644
--- a/cmd/testwrapper/flakytest/flakytest.go
+++ b/cmd/testwrapper/flakytest/flakytest.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package flakytest contains test helpers for marking a test as flaky. For
 // tests run using cmd/testwrapper, a failed flaky test will cause tests to be
diff --git a/cmd/testwrapper/flakytest/flakytest_test.go b/cmd/testwrapper/flakytest/flakytest_test.go
index 7e64a4c6b..c6b46eb0b 100644
--- a/cmd/testwrapper/flakytest/flakytest_test.go
+++ b/cmd/testwrapper/flakytest/flakytest_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package flakytest
 
diff --git a/cmd/testwrapper/testwrapper.go b/cmd/testwrapper/testwrapper.go
index a1ec34861..4c41af66a 100644
--- a/cmd/testwrapper/testwrapper.go
+++ b/cmd/testwrapper/testwrapper.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // testwrapper is a wrapper for retrying flaky tests, using the -exec flag of
 // 'go test'. Tests that are flaky can use the 'flakytest' subpackage to mark
diff --git a/cmd/tsconnect/build-pkg.go b/cmd/tsconnect/build-pkg.go
index 3942260c7..5c97258e0 100644
--- a/cmd/tsconnect/build-pkg.go
+++ b/cmd/tsconnect/build-pkg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tsconnect/build.go b/cmd/tsconnect/build.go
index ff638370b..6178ddb9b 100644
--- a/cmd/tsconnect/build.go
+++ b/cmd/tsconnect/build.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tsconnect/common.go b/cmd/tsconnect/common.go
index 9c112f8ac..20ed0117b 100644
--- a/cmd/tsconnect/common.go
+++ b/cmd/tsconnect/common.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tsconnect/dev-pkg.go b/cmd/tsconnect/dev-pkg.go
index f66290bf4..b23e323e4 100644
--- a/cmd/tsconnect/dev-pkg.go
+++ b/cmd/tsconnect/dev-pkg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tsconnect/dev.go b/cmd/tsconnect/dev.go
index c2a264cea..60e747270 100644
--- a/cmd/tsconnect/dev.go
+++ b/cmd/tsconnect/dev.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tsconnect/package.json.tmpl b/cmd/tsconnect/package.json.tmpl
index 1f461ecfd..404b896ea 100644
--- a/cmd/tsconnect/package.json.tmpl
+++ b/cmd/tsconnect/package.json.tmpl
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Template for the package.json that is generated by the build-pkg command.
 // The version number will be replaced by the current Tailscale client version
diff --git a/cmd/tsconnect/serve.go b/cmd/tsconnect/serve.go
index 71fbf1303..49e7d3135 100644
--- a/cmd/tsconnect/serve.go
+++ b/cmd/tsconnect/serve.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/cmd/tsconnect/src/app/app.tsx b/cmd/tsconnect/src/app/app.tsx
index 6f5de1b97..01d73e7dd 100644
--- a/cmd/tsconnect/src/app/app.tsx
+++ b/cmd/tsconnect/src/app/app.tsx
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 import { render, Component } from "preact"
 import { URLDisplay } from "./url-display"
diff --git a/cmd/tsconnect/src/app/go-panic-display.tsx b/cmd/tsconnect/src/app/go-panic-display.tsx
index d7c0b808f..5dd7095a2 100644
--- a/cmd/tsconnect/src/app/go-panic-display.tsx
+++ b/cmd/tsconnect/src/app/go-panic-display.tsx
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 export function GoPanicDisplay({
   error,
diff --git a/cmd/tsconnect/src/app/header.tsx b/cmd/tsconnect/src/app/header.tsx
index 67d5ae31e..f3262517e 100644
--- a/cmd/tsconnect/src/app/header.tsx
+++ b/cmd/tsconnect/src/app/header.tsx
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 export function Header({ state, ipn }: { state: IPNState; ipn?: IPN }) {
   const stateText = STATE_LABELS[state]
diff --git a/cmd/tsconnect/src/app/index.css b/cmd/tsconnect/src/app/index.css
index 24dd0cb64..751b313d9 100644
--- a/cmd/tsconnect/src/app/index.css
+++ b/cmd/tsconnect/src/app/index.css
@@ -1,6 +1,5 @@
-/* Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved. */
-/* Use of this source code is governed by a BSD-style */
-/* license that can be found in the LICENSE file. */
+/* Copyright (c) Tailscale Inc & AUTHORS */
+/* SPDX-License-Identifier: BSD-3-Clause */
 
 @import "xterm/css/xterm.css";
 
diff --git a/cmd/tsconnect/src/app/index.ts b/cmd/tsconnect/src/app/index.ts
index 312b44510..24ca45439 100644
--- a/cmd/tsconnect/src/app/index.ts
+++ b/cmd/tsconnect/src/app/index.ts
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 import "../wasm_exec"
 import wasmUrl from "./main.wasm"
diff --git a/cmd/tsconnect/src/app/ssh.tsx b/cmd/tsconnect/src/app/ssh.tsx
index 05ce130dc..a15f42b6d 100644
--- a/cmd/tsconnect/src/app/ssh.tsx
+++ b/cmd/tsconnect/src/app/ssh.tsx
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 import { useState, useCallback, useMemo, useEffect, useRef } from "preact/hooks"
 import { createPortal } from "preact/compat"
diff --git a/cmd/tsconnect/src/app/url-display.tsx b/cmd/tsconnect/src/app/url-display.tsx
index 47ee1fe4c..fc82c7fb9 100644
--- a/cmd/tsconnect/src/app/url-display.tsx
+++ b/cmd/tsconnect/src/app/url-display.tsx
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 import { useState } from "preact/hooks"
 import * as qrcode from "qrcode"
diff --git a/cmd/tsconnect/src/lib/js-state-store.ts b/cmd/tsconnect/src/lib/js-state-store.ts
index 98b5aef37..e57dfd98e 100644
--- a/cmd/tsconnect/src/lib/js-state-store.ts
+++ b/cmd/tsconnect/src/lib/js-state-store.ts
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 /** @fileoverview Callbacks used by jsStateStore to persist IPN state. */
 
diff --git a/cmd/tsconnect/src/pkg/pkg.css b/cmd/tsconnect/src/pkg/pkg.css
index a1852f034..76ea21f5b 100644
--- a/cmd/tsconnect/src/pkg/pkg.css
+++ b/cmd/tsconnect/src/pkg/pkg.css
@@ -1,6 +1,5 @@
-/* Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved. */
-/* Use of this source code is governed by a BSD-style */
-/* license that can be found in the LICENSE file. */
+/* Copyright (c) Tailscale Inc & AUTHORS */
+/* SPDX-License-Identifier: BSD-3-Clause */
 
 @import "xterm/css/xterm.css";
 
diff --git a/cmd/tsconnect/src/pkg/pkg.ts b/cmd/tsconnect/src/pkg/pkg.ts
index 317f08b66..4d535cb40 100644
--- a/cmd/tsconnect/src/pkg/pkg.ts
+++ b/cmd/tsconnect/src/pkg/pkg.ts
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Type definitions need to be manually imported for dts-bundle-generator to
 // discover them.
diff --git a/cmd/tsconnect/src/types/esbuild.d.ts b/cmd/tsconnect/src/types/esbuild.d.ts
index c245918b5..ef28f7b1c 100644
--- a/cmd/tsconnect/src/types/esbuild.d.ts
+++ b/cmd/tsconnect/src/types/esbuild.d.ts
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 /**
  * @fileoverview Type definitions for types generated by the esbuild build
diff --git a/cmd/tsconnect/src/types/wasm_js.d.ts b/cmd/tsconnect/src/types/wasm_js.d.ts
index 1802014fc..c985b356f 100644
--- a/cmd/tsconnect/src/types/wasm_js.d.ts
+++ b/cmd/tsconnect/src/types/wasm_js.d.ts
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 /**
  * @fileoverview Type definitions for types exported by the wasm_js.go Go
diff --git a/cmd/tsconnect/tsconnect.go b/cmd/tsconnect/tsconnect.go
index 6719e45dd..8a806448b 100644
--- a/cmd/tsconnect/tsconnect.go
+++ b/cmd/tsconnect/tsconnect.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The tsconnect command builds and serves the static site that is generated for
 // the Tailscale Connect JS/WASM client. Can be run in 3 modes:
diff --git a/cmd/tsconnect/wasm/wasm_js.go b/cmd/tsconnect/wasm/wasm_js.go
index aaaeef1ce..3ff9bfff4 100644
--- a/cmd/tsconnect/wasm/wasm_js.go
+++ b/cmd/tsconnect/wasm/wasm_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The wasm package builds a WebAssembly module that provides a subset of
 // Tailscale APIs to JavaScript.
diff --git a/cmd/tsshd/tsshd.go b/cmd/tsshd/tsshd.go
index a14031bae..950eb661c 100644
--- a/cmd/tsshd/tsshd.go
+++ b/cmd/tsshd/tsshd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ignore
 
diff --git a/cmd/viewer/tests/tests.go b/cmd/viewer/tests/tests.go
index 1a2264c6c..e281ccb6d 100644
--- a/cmd/viewer/tests/tests.go
+++ b/cmd/viewer/tests/tests.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tests serves a list of tests for tailscale.com/cmd/viewer.
 package tests
diff --git a/cmd/viewer/tests/tests_clone.go b/cmd/viewer/tests/tests_clone.go
index 8cad5f3f3..2558d9ae2 100644
--- a/cmd/viewer/tests/tests_clone.go
+++ b/cmd/viewer/tests/tests_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/cmd/viewer/tests/tests_view.go b/cmd/viewer/tests/tests_view.go
index a01853553..7f8d31e01 100644
--- a/cmd/viewer/tests/tests_view.go
+++ b/cmd/viewer/tests/tests_view.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale/cmd/viewer; DO NOT EDIT.
 
diff --git a/cmd/viewer/viewer.go b/cmd/viewer/viewer.go
index 4ba6d4b56..058d107fc 100644
--- a/cmd/viewer/viewer.go
+++ b/cmd/viewer/viewer.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Viewer is a tool to automate the creation of "view" wrapper types that
 // provide read-only accessor methods to underlying fields.
diff --git a/control/controlbase/conn.go b/control/controlbase/conn.go
index cccdd40ab..55165debf 100644
--- a/control/controlbase/conn.go
+++ b/control/controlbase/conn.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package controlbase implements the base transport of the Tailscale
 // 2021 control protocol.
diff --git a/control/controlbase/conn_test.go b/control/controlbase/conn_test.go
index 04f3f69b8..17eaae617 100644
--- a/control/controlbase/conn_test.go
+++ b/control/controlbase/conn_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlbase
 
diff --git a/control/controlbase/handshake.go b/control/controlbase/handshake.go
index b18e08a37..765a4620b 100644
--- a/control/controlbase/handshake.go
+++ b/control/controlbase/handshake.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlbase
 
diff --git a/control/controlbase/handshake_test.go b/control/controlbase/handshake_test.go
index 755454c1c..a84f730e7 100644
--- a/control/controlbase/handshake_test.go
+++ b/control/controlbase/handshake_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlbase
 
diff --git a/control/controlbase/interop_test.go b/control/controlbase/interop_test.go
index 133db8bc5..d980b2198 100644
--- a/control/controlbase/interop_test.go
+++ b/control/controlbase/interop_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlbase
 
diff --git a/control/controlbase/messages.go b/control/controlbase/messages.go
index 62d42c2f2..59073088f 100644
--- a/control/controlbase/messages.go
+++ b/control/controlbase/messages.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlbase
 
diff --git a/control/controlclient/auto.go b/control/controlclient/auto.go
index b331749a8..cfdb6b78b 100644
--- a/control/controlclient/auto.go
+++ b/control/controlclient/auto.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/client.go b/control/controlclient/client.go
index b8e1bde04..80e56790e 100644
--- a/control/controlclient/client.go
+++ b/control/controlclient/client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package controlclient implements the client for the Tailscale
 // control plane.
diff --git a/control/controlclient/controlclient_test.go b/control/controlclient/controlclient_test.go
index a203d3f18..086721eea 100644
--- a/control/controlclient/controlclient_test.go
+++ b/control/controlclient/controlclient_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/debug.go b/control/controlclient/debug.go
index bc58b4fd5..288abfab4 100644
--- a/control/controlclient/debug.go
+++ b/control/controlclient/debug.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/direct.go b/control/controlclient/direct.go
index 1b9b3fe6e..aa0e84293 100644
--- a/control/controlclient/direct.go
+++ b/control/controlclient/direct.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/direct_test.go b/control/controlclient/direct_test.go
index 54a33c1cf..4ee33eb71 100644
--- a/control/controlclient/direct_test.go
+++ b/control/controlclient/direct_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/map.go b/control/controlclient/map.go
index f04fe7482..e1161c34a 100644
--- a/control/controlclient/map.go
+++ b/control/controlclient/map.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/map_test.go b/control/controlclient/map_test.go
index 4c5d1dc01..b2f605600 100644
--- a/control/controlclient/map_test.go
+++ b/control/controlclient/map_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/noise.go b/control/controlclient/noise.go
index 884ba0375..826b0c249 100644
--- a/control/controlclient/noise.go
+++ b/control/controlclient/noise.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/noise_test.go b/control/controlclient/noise_test.go
index 9485177d6..049e260fe 100644
--- a/control/controlclient/noise_test.go
+++ b/control/controlclient/noise_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/sign.go b/control/controlclient/sign.go
index c57f075d5..e3a479c28 100644
--- a/control/controlclient/sign.go
+++ b/control/controlclient/sign.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlclient/sign_supported.go b/control/controlclient/sign_supported.go
index 75e3c33d0..c7525b7a7 100644
--- a/control/controlclient/sign_supported.go
+++ b/control/controlclient/sign_supported.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows && cgo
 
diff --git a/control/controlclient/sign_supported_test.go b/control/controlclient/sign_supported_test.go
index 4fdb313d9..e20349a4e 100644
--- a/control/controlclient/sign_supported_test.go
+++ b/control/controlclient/sign_supported_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows && cgo
 
diff --git a/control/controlclient/sign_unsupported.go b/control/controlclient/sign_unsupported.go
index c1a1813a7..6d7ea21d2 100644
--- a/control/controlclient/sign_unsupported.go
+++ b/control/controlclient/sign_unsupported.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows || !cgo
 
diff --git a/control/controlclient/status.go b/control/controlclient/status.go
index f950c4b59..294c5dbb2 100644
--- a/control/controlclient/status.go
+++ b/control/controlclient/status.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlclient
 
diff --git a/control/controlhttp/client.go b/control/controlhttp/client.go
index 62affe117..dd8e0057a 100644
--- a/control/controlhttp/client.go
+++ b/control/controlhttp/client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/control/controlhttp/client_common.go b/control/controlhttp/client_common.go
index b8b28132f..dd94e93cd 100644
--- a/control/controlhttp/client_common.go
+++ b/control/controlhttp/client_common.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlhttp
 
diff --git a/control/controlhttp/client_js.go b/control/controlhttp/client_js.go
index 0dfb82b91..5a4b4d08b 100644
--- a/control/controlhttp/client_js.go
+++ b/control/controlhttp/client_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlhttp
 
diff --git a/control/controlhttp/constants.go b/control/controlhttp/constants.go
index 20bcc70a0..9a7da22f6 100644
--- a/control/controlhttp/constants.go
+++ b/control/controlhttp/constants.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlhttp
 
diff --git a/control/controlhttp/http_test.go b/control/controlhttp/http_test.go
index 6c380f369..128421a25 100644
--- a/control/controlhttp/http_test.go
+++ b/control/controlhttp/http_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlhttp
 
diff --git a/control/controlhttp/server.go b/control/controlhttp/server.go
index e789510f5..d49e32c1d 100644
--- a/control/controlhttp/server.go
+++ b/control/controlhttp/server.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package controlhttp
 
diff --git a/control/controlknobs/controlknobs.go b/control/controlknobs/controlknobs.go
index 429d0af42..65492b39e 100644
--- a/control/controlknobs/controlknobs.go
+++ b/control/controlknobs/controlknobs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package controlknobs contains client options configurable from control which can be turned on
 // or off. The ability to turn options on and off is for incrementally adding features in.
diff --git a/derp/derp.go b/derp/derp.go
index 07817b581..b11192513 100644
--- a/derp/derp.go
+++ b/derp/derp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package derp implements the Designated Encrypted Relay for Packets (DERP)
 // protocol.
diff --git a/derp/derp_client.go b/derp/derp_client.go
index 9f14dca70..0118ca730 100644
--- a/derp/derp_client.go
+++ b/derp/derp_client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derp
 
diff --git a/derp/derp_server.go b/derp/derp_server.go
index 924192477..1f1c22650 100644
--- a/derp/derp_server.go
+++ b/derp/derp_server.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derp
 
diff --git a/derp/derp_server_default.go b/derp/derp_server_default.go
index 32207b350..777768ce8 100644
--- a/derp/derp_server_default.go
+++ b/derp/derp_server_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux
 
diff --git a/derp/derp_server_linux.go b/derp/derp_server_linux.go
index 80c30e1ad..1029226a6 100644
--- a/derp/derp_server_linux.go
+++ b/derp/derp_server_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derp
 
diff --git a/derp/derp_test.go b/derp/derp_test.go
index 2edcb057a..ed950ea28 100644
--- a/derp/derp_test.go
+++ b/derp/derp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derp
 
diff --git a/derp/derphttp/derphttp_client.go b/derp/derphttp/derphttp_client.go
index 6c56e3096..e02fd62c0 100644
--- a/derp/derphttp/derphttp_client.go
+++ b/derp/derphttp/derphttp_client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package derphttp implements DERP-over-HTTP.
 //
diff --git a/derp/derphttp/derphttp_server.go b/derp/derphttp/derphttp_server.go
index 17edb8c21..81d4c8a4b 100644
--- a/derp/derphttp/derphttp_server.go
+++ b/derp/derphttp/derphttp_server.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derphttp
 
diff --git a/derp/derphttp/derphttp_test.go b/derp/derphttp/derphttp_test.go
index bc6c008b2..5feca649b 100644
--- a/derp/derphttp/derphttp_test.go
+++ b/derp/derphttp/derphttp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derphttp
 
diff --git a/derp/derphttp/mesh_client.go b/derp/derphttp/mesh_client.go
index a77526727..22a43a6d8 100644
--- a/derp/derphttp/mesh_client.go
+++ b/derp/derphttp/mesh_client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package derphttp
 
diff --git a/derp/derphttp/websocket.go b/derp/derphttp/websocket.go
index ab651fb96..730f975ff 100644
--- a/derp/derphttp/websocket.go
+++ b/derp/derphttp/websocket.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || js
 
diff --git a/derp/dropreason_string.go b/derp/dropreason_string.go
index 5ed41a26b..9009ed703 100644
--- a/derp/dropreason_string.go
+++ b/derp/dropreason_string.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by "stringer -type=dropReason -trimprefix=dropReason"; DO NOT EDIT.
 
diff --git a/disco/disco.go b/disco/disco.go
index b01c591ae..0e7c3f7e5 100644
--- a/disco/disco.go
+++ b/disco/disco.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package disco contains the discovery message types.
 //
diff --git a/disco/disco_fuzzer.go b/disco/disco_fuzzer.go
index 647cd0d61..b9ffabfb0 100644
--- a/disco/disco_fuzzer.go
+++ b/disco/disco_fuzzer.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 //go:build gofuzz
 
 package disco
diff --git a/disco/disco_test.go b/disco/disco_test.go
index 84fa440cd..f8ebed7fa 100644
--- a/disco/disco_test.go
+++ b/disco/disco_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package disco
 
diff --git a/docs/k8s/Makefile b/docs/k8s/Makefile
index 826a68b65..531a2ca7a 100644
--- a/docs/k8s/Makefile
+++ b/docs/k8s/Makefile
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 
 TS_ROUTES ?= ""
 SA_NAME ?= tailscale
diff --git a/docs/k8s/proxy.yaml b/docs/k8s/proxy.yaml
index 792c3d779..b5125484d 100644
--- a/docs/k8s/proxy.yaml
+++ b/docs/k8s/proxy.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: v1
 kind: Pod
 metadata:
diff --git a/docs/k8s/role.yaml b/docs/k8s/role.yaml
index 7343ef236..6d6a8117d 100644
--- a/docs/k8s/role.yaml
+++ b/docs/k8s/role.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: rbac.authorization.k8s.io/v1
 kind: Role
 metadata:
diff --git a/docs/k8s/rolebinding.yaml b/docs/k8s/rolebinding.yaml
index 1f3bb3cd7..3b18ba8d3 100644
--- a/docs/k8s/rolebinding.yaml
+++ b/docs/k8s/rolebinding.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
 metadata:
diff --git a/docs/k8s/sa.yaml b/docs/k8s/sa.yaml
index 1be5a97b9..edd3944ba 100644
--- a/docs/k8s/sa.yaml
+++ b/docs/k8s/sa.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: v1
 kind: ServiceAccount
 metadata:
diff --git a/docs/k8s/sidecar.yaml b/docs/k8s/sidecar.yaml
index 8855430df..e35d78e3e 100644
--- a/docs/k8s/sidecar.yaml
+++ b/docs/k8s/sidecar.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: v1
 kind: Pod
 metadata:
diff --git a/docs/k8s/subnet.yaml b/docs/k8s/subnet.yaml
index a4c6b0802..e4b9b0969 100644
--- a/docs/k8s/subnet.yaml
+++ b/docs/k8s/subnet.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: v1
 kind: Pod
 metadata:
diff --git a/docs/k8s/userspace-sidecar.yaml b/docs/k8s/userspace-sidecar.yaml
index cad3040e9..fc4ed6350 100644
--- a/docs/k8s/userspace-sidecar.yaml
+++ b/docs/k8s/userspace-sidecar.yaml
@@ -1,6 +1,5 @@
-# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 apiVersion: v1
 kind: Pod
 metadata:
diff --git a/docs/webhooks/example.go b/docs/webhooks/example.go
index 7a70ad52a..6811a95e6 100644
--- a/docs/webhooks/example.go
+++ b/docs/webhooks/example.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package webhooks provides example consumer code for Tailscale
 // webhooks.
diff --git a/doctor/doctor.go b/doctor/doctor.go
index ca0cafbec..7c3047e12 100644
--- a/doctor/doctor.go
+++ b/doctor/doctor.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package doctor contains more in-depth healthchecks that can be run to aid in
 // diagnosing Tailscale issues.
diff --git a/doctor/doctor_test.go b/doctor/doctor_test.go
index ff0c650a1..87250f10e 100644
--- a/doctor/doctor_test.go
+++ b/doctor/doctor_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package doctor
 
diff --git a/doctor/routetable/routetable.go b/doctor/routetable/routetable.go
index 7138fb3df..76e4ef949 100644
--- a/doctor/routetable/routetable.go
+++ b/doctor/routetable/routetable.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package routetable provides a doctor.Check that dumps the current system's
 // route table to the log.
diff --git a/envknob/envknob.go b/envknob/envknob.go
index bbac2003a..6d24f392e 100644
--- a/envknob/envknob.go
+++ b/envknob/envknob.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package envknob provides access to environment-variable tweakable
 // debug settings.
diff --git a/envknob/envknob_nottest.go b/envknob/envknob_nottest.go
index b49d82e2c..0dd900cc8 100644
--- a/envknob/envknob_nottest.go
+++ b/envknob/envknob_nottest.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ts_not_in_tests
 
diff --git a/envknob/envknob_testable.go b/envknob/envknob_testable.go
index 2b126d240..e7f038336 100644
--- a/envknob/envknob_testable.go
+++ b/envknob/envknob_testable.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ts_not_in_tests
 
diff --git a/health/health.go b/health/health.go
index 875509e05..3517c4be3 100644
--- a/health/health.go
+++ b/health/health.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package health is a registry for other packages to report & check
 // overall health status of the node.
diff --git a/health/health_test.go b/health/health_test.go
index 742483843..221a37dec 100644
--- a/health/health_test.go
+++ b/health/health_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package health
 
diff --git a/health/healthmsg/healthmsg.go b/health/healthmsg/healthmsg.go
index 0ede81419..b0064547a 100644
--- a/health/healthmsg/healthmsg.go
+++ b/health/healthmsg/healthmsg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package healthmsg contains some constants for health messages.
 //
diff --git a/hostinfo/hostinfo.go b/hostinfo/hostinfo.go
index d86fbf97b..8dc53fa49 100644
--- a/hostinfo/hostinfo.go
+++ b/hostinfo/hostinfo.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package hostinfo answers questions about the host environment that Tailscale is
 // running on.
diff --git a/hostinfo/hostinfo_darwin.go b/hostinfo/hostinfo_darwin.go
index 60a9f37ba..0b1774e77 100644
--- a/hostinfo/hostinfo_darwin.go
+++ b/hostinfo/hostinfo_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin
 
diff --git a/hostinfo/hostinfo_freebsd.go b/hostinfo/hostinfo_freebsd.go
index e3383d4f4..3661b1322 100644
--- a/hostinfo/hostinfo_freebsd.go
+++ b/hostinfo/hostinfo_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build freebsd
 
diff --git a/hostinfo/hostinfo_linux.go b/hostinfo/hostinfo_linux.go
index d83bfa903..8d647872c 100644
--- a/hostinfo/hostinfo_linux.go
+++ b/hostinfo/hostinfo_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux && !android
 
diff --git a/hostinfo/hostinfo_linux_test.go b/hostinfo/hostinfo_linux_test.go
index 5d428d3ee..4859167a2 100644
--- a/hostinfo/hostinfo_linux_test.go
+++ b/hostinfo/hostinfo_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux && !android
 
diff --git a/hostinfo/hostinfo_test.go b/hostinfo/hostinfo_test.go
index 8ec232d43..9fe32e044 100644
--- a/hostinfo/hostinfo_test.go
+++ b/hostinfo/hostinfo_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package hostinfo
 
diff --git a/hostinfo/hostinfo_uname.go b/hostinfo/hostinfo_uname.go
index 50a92d4fa..32b733a03 100644
--- a/hostinfo/hostinfo_uname.go
+++ b/hostinfo/hostinfo_uname.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || freebsd || openbsd || darwin
 
diff --git a/hostinfo/hostinfo_windows.go b/hostinfo/hostinfo_windows.go
index d2732ae77..3401655f4 100644
--- a/hostinfo/hostinfo_windows.go
+++ b/hostinfo/hostinfo_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package hostinfo
 
diff --git a/internal/tooldeps/tooldeps.go b/internal/tooldeps/tooldeps.go
index c59600492..adfac23b6 100644
--- a/internal/tooldeps/tooldeps.go
+++ b/internal/tooldeps/tooldeps.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build for_go_mod_tidy_only
 
diff --git a/ipn/backend.go b/ipn/backend.go
index 9b66b6105..806598aa2 100644
--- a/ipn/backend.go
+++ b/ipn/backend.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipn
 
diff --git a/ipn/doc.go b/ipn/doc.go
index 1b3bfd857..4b3810be1 100644
--- a/ipn/doc.go
+++ b/ipn/doc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:generate go run tailscale.com/cmd/viewer -type=Prefs,ServeConfig,TCPPortHandler,HTTPHandler,WebServerConfig
 
diff --git a/ipn/fake_test.go b/ipn/fake_test.go
index 92912903c..5e1ef0637 100644
--- a/ipn/fake_test.go
+++ b/ipn/fake_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipn
 
diff --git a/ipn/ipn_clone.go b/ipn/ipn_clone.go
index 8f9bc0567..9dfd9f0c1 100644
--- a/ipn/ipn_clone.go
+++ b/ipn/ipn_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/ipn/ipn_view.go b/ipn/ipn_view.go
index 2209cb0a1..94da4eb3e 100644
--- a/ipn/ipn_view.go
+++ b/ipn/ipn_view.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale/cmd/viewer; DO NOT EDIT.
 
diff --git a/ipn/ipnauth/ipnauth.go b/ipn/ipnauth/ipnauth.go
index 136ab3c2b..a83ca459b 100644
--- a/ipn/ipnauth/ipnauth.go
+++ b/ipn/ipnauth/ipnauth.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package ipnauth controls access to the LocalAPI.
 package ipnauth
diff --git a/ipn/ipnauth/ipnauth_notwindows.go b/ipn/ipnauth/ipnauth_notwindows.go
index f0ef9c58c..0a6275e65 100644
--- a/ipn/ipnauth/ipnauth_notwindows.go
+++ b/ipn/ipnauth/ipnauth_notwindows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/ipn/ipnauth/ipnauth_windows.go b/ipn/ipnauth/ipnauth_windows.go
index 6349b399a..abf795832 100644
--- a/ipn/ipnauth/ipnauth_windows.go
+++ b/ipn/ipnauth/ipnauth_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnauth
 
diff --git a/ipn/ipnlocal/c2n.go b/ipn/ipnlocal/c2n.go
index 7df4e34af..86c5542a6 100644
--- a/ipn/ipnlocal/c2n.go
+++ b/ipn/ipnlocal/c2n.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/cert.go b/ipn/ipnlocal/cert.go
index 727e5d9e5..fb2ffc12c 100644
--- a/ipn/ipnlocal/cert.go
+++ b/ipn/ipnlocal/cert.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/ipn/ipnlocal/cert_js.go b/ipn/ipnlocal/cert_js.go
index c14d6094d..a5fdfc4ba 100644
--- a/ipn/ipnlocal/cert_js.go
+++ b/ipn/ipnlocal/cert_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/cert_test.go b/ipn/ipnlocal/cert_test.go
index e3f741809..387cbfbe4 100644
--- a/ipn/ipnlocal/cert_test.go
+++ b/ipn/ipnlocal/cert_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !android && !js
 
diff --git a/ipn/ipnlocal/dnsconfig_test.go b/ipn/ipnlocal/dnsconfig_test.go
index b00cf098c..5b0a7e387 100644
--- a/ipn/ipnlocal/dnsconfig_test.go
+++ b/ipn/ipnlocal/dnsconfig_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/expiry.go b/ipn/ipnlocal/expiry.go
index 2aa7cba31..289955db1 100644
--- a/ipn/ipnlocal/expiry.go
+++ b/ipn/ipnlocal/expiry.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/expiry_test.go b/ipn/ipnlocal/expiry_test.go
index 41b1f8bff..974453f45 100644
--- a/ipn/ipnlocal/expiry_test.go
+++ b/ipn/ipnlocal/expiry_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/local.go b/ipn/ipnlocal/local.go
index d7bf6c054..fcfd6ebf8 100644
--- a/ipn/ipnlocal/local.go
+++ b/ipn/ipnlocal/local.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/local_test.go b/ipn/ipnlocal/local_test.go
index c57666f93..dd6f43636 100644
--- a/ipn/ipnlocal/local_test.go
+++ b/ipn/ipnlocal/local_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/loglines_test.go b/ipn/ipnlocal/loglines_test.go
index 1c6cb7c27..52a64136e 100644
--- a/ipn/ipnlocal/loglines_test.go
+++ b/ipn/ipnlocal/loglines_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/network-lock.go b/ipn/ipnlocal/network-lock.go
index 8a7d3a466..c8b1da764 100644
--- a/ipn/ipnlocal/network-lock.go
+++ b/ipn/ipnlocal/network-lock.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/network-lock_test.go b/ipn/ipnlocal/network-lock_test.go
index 3f915818e..0d555be43 100644
--- a/ipn/ipnlocal/network-lock_test.go
+++ b/ipn/ipnlocal/network-lock_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/peerapi.go b/ipn/ipnlocal/peerapi.go
index f6a4167e3..adbba0eda 100644
--- a/ipn/ipnlocal/peerapi.go
+++ b/ipn/ipnlocal/peerapi.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/peerapi_h2c.go b/ipn/ipnlocal/peerapi_h2c.go
index 3f8fb45c6..fbfa86398 100644
--- a/ipn/ipnlocal/peerapi_h2c.go
+++ b/ipn/ipnlocal/peerapi_h2c.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !android && !js
 
diff --git a/ipn/ipnlocal/peerapi_macios_ext.go b/ipn/ipnlocal/peerapi_macios_ext.go
index f056c5edd..c1a09ddf1 100644
--- a/ipn/ipnlocal/peerapi_macios_ext.go
+++ b/ipn/ipnlocal/peerapi_macios_ext.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ts_macext && (darwin || ios)
 
diff --git a/ipn/ipnlocal/peerapi_test.go b/ipn/ipnlocal/peerapi_test.go
index 4566e0b9f..f6d5b8c23 100644
--- a/ipn/ipnlocal/peerapi_test.go
+++ b/ipn/ipnlocal/peerapi_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/profiles.go b/ipn/ipnlocal/profiles.go
index e807cf739..ec3ee1002 100644
--- a/ipn/ipnlocal/profiles.go
+++ b/ipn/ipnlocal/profiles.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/profiles_test.go b/ipn/ipnlocal/profiles_test.go
index c977676ba..dcaf463e9 100644
--- a/ipn/ipnlocal/profiles_test.go
+++ b/ipn/ipnlocal/profiles_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/serve.go b/ipn/ipnlocal/serve.go
index c350efb27..6e12c4b0f 100644
--- a/ipn/ipnlocal/serve.go
+++ b/ipn/ipnlocal/serve.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/serve_test.go b/ipn/ipnlocal/serve_test.go
index 8bd90ee65..a440bce97 100644
--- a/ipn/ipnlocal/serve_test.go
+++ b/ipn/ipnlocal/serve_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnlocal/ssh.go b/ipn/ipnlocal/ssh.go
index fa428e386..6fa56d7d9 100644
--- a/ipn/ipnlocal/ssh.go
+++ b/ipn/ipnlocal/ssh.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || (darwin && !ios) || freebsd || openbsd
 
diff --git a/ipn/ipnlocal/ssh_stub.go b/ipn/ipnlocal/ssh_stub.go
index 9d0cfd4db..abdc65c74 100644
--- a/ipn/ipnlocal/ssh_stub.go
+++ b/ipn/ipnlocal/ssh_stub.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ios || (!linux && !darwin && !freebsd && !openbsd)
 
diff --git a/ipn/ipnlocal/ssh_test.go b/ipn/ipnlocal/ssh_test.go
index b82f9b948..837924965 100644
--- a/ipn/ipnlocal/ssh_test.go
+++ b/ipn/ipnlocal/ssh_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || (darwin && !ios)
 
diff --git a/ipn/ipnlocal/state_test.go b/ipn/ipnlocal/state_test.go
index a66ec46f0..39af2c63f 100644
--- a/ipn/ipnlocal/state_test.go
+++ b/ipn/ipnlocal/state_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnlocal
 
diff --git a/ipn/ipnserver/proxyconnect.go b/ipn/ipnserver/proxyconnect.go
index b1c8c76f4..eb8c55991 100644
--- a/ipn/ipnserver/proxyconnect.go
+++ b/ipn/ipnserver/proxyconnect.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/ipn/ipnserver/proxyconnect_js.go b/ipn/ipnserver/proxyconnect_js.go
index 843f50180..368221e22 100644
--- a/ipn/ipnserver/proxyconnect_js.go
+++ b/ipn/ipnserver/proxyconnect_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnserver
 
diff --git a/ipn/ipnserver/server.go b/ipn/ipnserver/server.go
index c18817067..355c02193 100644
--- a/ipn/ipnserver/server.go
+++ b/ipn/ipnserver/server.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnserver
 
diff --git a/ipn/ipnserver/server_test.go b/ipn/ipnserver/server_test.go
index 4eba917ab..b7d5ea144 100644
--- a/ipn/ipnserver/server_test.go
+++ b/ipn/ipnserver/server_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipnserver
 
diff --git a/ipn/ipnstate/ipnstate.go b/ipn/ipnstate/ipnstate.go
index 561a43506..9f127a021 100644
--- a/ipn/ipnstate/ipnstate.go
+++ b/ipn/ipnstate/ipnstate.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package ipnstate captures the entire state of the Tailscale network.
 //
diff --git a/ipn/ipnstate/ipnstate_clone.go b/ipn/ipnstate/ipnstate_clone.go
index 438538f2f..c96b8e575 100644
--- a/ipn/ipnstate/ipnstate_clone.go
+++ b/ipn/ipnstate/ipnstate_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/ipn/localapi/cert.go b/ipn/localapi/cert.go
index 5eff76da1..06dd46baa 100644
--- a/ipn/localapi/cert.go
+++ b/ipn/localapi/cert.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !android && !js
 
diff --git a/ipn/localapi/debugderp.go b/ipn/localapi/debugderp.go
index 4a598f261..fac8ebeb7 100644
--- a/ipn/localapi/debugderp.go
+++ b/ipn/localapi/debugderp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package localapi
 
diff --git a/ipn/localapi/disabled_stubs.go b/ipn/localapi/disabled_stubs.go
index 0c762ed3d..c744f34d5 100644
--- a/ipn/localapi/disabled_stubs.go
+++ b/ipn/localapi/disabled_stubs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ios || android || js
 
diff --git a/ipn/localapi/localapi.go b/ipn/localapi/localapi.go
index 18a1942cf..130f99abc 100644
--- a/ipn/localapi/localapi.go
+++ b/ipn/localapi/localapi.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package localapi contains the HTTP server handlers for tailscaled's API server.
 package localapi
diff --git a/ipn/localapi/pprof.go b/ipn/localapi/pprof.go
index ab97b7dae..8c9429b31 100644
--- a/ipn/localapi/pprof.go
+++ b/ipn/localapi/pprof.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !android && !js
 
diff --git a/ipn/policy/policy.go b/ipn/policy/policy.go
index 2308b9516..2765ee789 100644
--- a/ipn/policy/policy.go
+++ b/ipn/policy/policy.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package policy contains various policy decisions that need to be
 // shared between the node client & control server.
diff --git a/ipn/prefs.go b/ipn/prefs.go
index 8098d55a0..e79da0d09 100644
--- a/ipn/prefs.go
+++ b/ipn/prefs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipn
 
diff --git a/ipn/prefs_test.go b/ipn/prefs_test.go
index 0673cc15f..3a1e30619 100644
--- a/ipn/prefs_test.go
+++ b/ipn/prefs_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipn
 
diff --git a/ipn/serve.go b/ipn/serve.go
index a0c6849a1..4eca96637 100644
--- a/ipn/serve.go
+++ b/ipn/serve.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipn
 
diff --git a/ipn/store.go b/ipn/store.go
index a59952c3f..f50f33c1b 100644
--- a/ipn/store.go
+++ b/ipn/store.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ipn
 
diff --git a/ipn/store/awsstore/store_aws.go b/ipn/store/awsstore/store_aws.go
index 513285f6a..1741cfe02 100644
--- a/ipn/store/awsstore/store_aws.go
+++ b/ipn/store/awsstore/store_aws.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux && !ts_omit_aws
 
diff --git a/ipn/store/awsstore/store_aws_stub.go b/ipn/store/awsstore/store_aws_stub.go
index 6e9dab1cb..8d2156ce9 100644
--- a/ipn/store/awsstore/store_aws_stub.go
+++ b/ipn/store/awsstore/store_aws_stub.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux || ts_omit_aws
 
diff --git a/ipn/store/awsstore/store_aws_test.go b/ipn/store/awsstore/store_aws_test.go
index 5fd2dc904..f6c8fedb3 100644
--- a/ipn/store/awsstore/store_aws_test.go
+++ b/ipn/store/awsstore/store_aws_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/ipn/store/kubestore/store_kube.go b/ipn/store/kubestore/store_kube.go
index cc1466abe..0d3a01f7b 100644
--- a/ipn/store/kubestore/store_kube.go
+++ b/ipn/store/kubestore/store_kube.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package kubestore contains an ipn.StateStore implementation using Kubernetes Secrets.
 
diff --git a/ipn/store/mem/store_mem.go b/ipn/store/mem/store_mem.go
index 5c41acad4..a826d29a4 100644
--- a/ipn/store/mem/store_mem.go
+++ b/ipn/store/mem/store_mem.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package mem provides an in-memory ipn.StateStore implementation.
 package mem
diff --git a/ipn/store/stores.go b/ipn/store/stores.go
index 8792a50c4..efaf65a00 100644
--- a/ipn/store/stores.go
+++ b/ipn/store/stores.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package store provides various implementation of ipn.StateStore.
 package store
diff --git a/ipn/store/stores_linux.go b/ipn/store/stores_linux.go
index e7dd0d799..2e26de2df 100644
--- a/ipn/store/stores_linux.go
+++ b/ipn/store/stores_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package store
 
diff --git a/ipn/store/stores_test.go b/ipn/store/stores_test.go
index 1664b82f9..ea09e6ea6 100644
--- a/ipn/store/stores_test.go
+++ b/ipn/store/stores_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package store
 
diff --git a/jsondb/db.go b/jsondb/db.go
index 3a0d8060a..68bb05af4 100644
--- a/jsondb/db.go
+++ b/jsondb/db.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package jsondb provides a trivial "database": a Go object saved to
 // disk as JSON.
diff --git a/jsondb/db_test.go b/jsondb/db_test.go
index df784194d..655754f38 100644
--- a/jsondb/db_test.go
+++ b/jsondb/db_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package jsondb
 
diff --git a/kube/api.go b/kube/api.go
index 8a2bfbc47..b49b76c34 100644
--- a/kube/api.go
+++ b/kube/api.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package kube
 
diff --git a/kube/client.go b/kube/client.go
index 57832c0f0..48aa658c5 100644
--- a/kube/client.go
+++ b/kube/client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package kube provides a client to interact with Kubernetes.
 // This package is Tailscale-internal and not meant for external consumption.
diff --git a/log/filelogger/log.go b/log/filelogger/log.go
index 01810c523..599e5237b 100644
--- a/log/filelogger/log.go
+++ b/log/filelogger/log.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package filelogger provides localdisk log writing & rotation, primarily for Windows
 // clients. (We get this for free on other platforms.)
diff --git a/log/filelogger/log_test.go b/log/filelogger/log_test.go
index 74977292f..dfa489637 100644
--- a/log/filelogger/log_test.go
+++ b/log/filelogger/log_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filelogger
 
diff --git a/log/logheap/logheap.go b/log/logheap/logheap.go
index 7112a794a..f645ec4c9 100644
--- a/log/logheap/logheap.go
+++ b/log/logheap/logheap.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/log/logheap/logheap_js.go b/log/logheap/logheap_js.go
index 9a6aab6b0..35453b482 100644
--- a/log/logheap/logheap_js.go
+++ b/log/logheap/logheap_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logheap
 
diff --git a/logpolicy/logpolicy.go b/logpolicy/logpolicy.go
index 854e4c25e..011d578e5 100644
--- a/logpolicy/logpolicy.go
+++ b/logpolicy/logpolicy.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package logpolicy manages the creation or reuse of logtail loggers,
 // caching collection instance state on disk for use on future runs of
diff --git a/logpolicy/logpolicy_test.go b/logpolicy/logpolicy_test.go
index cdb035317..fdbfe4506 100644
--- a/logpolicy/logpolicy_test.go
+++ b/logpolicy/logpolicy_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logpolicy
 
diff --git a/logtail/backoff/backoff.go b/logtail/backoff/backoff.go
index 269eaf342..ffec64ecd 100644
--- a/logtail/backoff/backoff.go
+++ b/logtail/backoff/backoff.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package backoff provides a back-off timer type.
 package backoff
diff --git a/logtail/buffer.go b/logtail/buffer.go
index f79b06b89..dbb0552f1 100644
--- a/logtail/buffer.go
+++ b/logtail/buffer.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logtail
 
diff --git a/logtail/example/logadopt/logadopt.go b/logtail/example/logadopt/logadopt.go
index fa4035d48..1b9d8be0a 100644
--- a/logtail/example/logadopt/logadopt.go
+++ b/logtail/example/logadopt/logadopt.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/logtail/example/logreprocess/demo.sh b/logtail/example/logreprocess/demo.sh
index 38ee88192..4ec819a67 100755
--- a/logtail/example/logreprocess/demo.sh
+++ b/logtail/example/logreprocess/demo.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
-# Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 
 #
 # This shell script demonstrates writing logs from machines
diff --git a/logtail/example/logreprocess/logreprocess.go b/logtail/example/logreprocess/logreprocess.go
index 6b89c244c..f2497fb41 100644
--- a/logtail/example/logreprocess/logreprocess.go
+++ b/logtail/example/logreprocess/logreprocess.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The logreprocess program tails a log and reprocesses it.
 package main
diff --git a/logtail/example/logtail/logtail.go b/logtail/example/logtail/logtail.go
index 46ae9426b..3f2600de5 100644
--- a/logtail/example/logtail/logtail.go
+++ b/logtail/example/logtail/logtail.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The logtail program logs stdin.
 package main
diff --git a/logtail/filch/filch.go b/logtail/filch/filch.go
index 34a38627c..d00206dd5 100644
--- a/logtail/filch/filch.go
+++ b/logtail/filch/filch.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package filch is a file system queue that pilfers your stderr.
 // (A FILe CHannel that filches.)
diff --git a/logtail/filch/filch_js.go b/logtail/filch/filch_js.go
index 69358925e..019ee4e14 100644
--- a/logtail/filch/filch_js.go
+++ b/logtail/filch/filch_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filch
 
diff --git a/logtail/filch/filch_test.go b/logtail/filch/filch_test.go
index d3db87654..ed02e8058 100644
--- a/logtail/filch/filch_test.go
+++ b/logtail/filch/filch_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filch
 
diff --git a/logtail/filch/filch_unix.go b/logtail/filch/filch_unix.go
index b404e7532..b782cabf9 100644
--- a/logtail/filch/filch_unix.go
+++ b/logtail/filch/filch_unix.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !js
 
diff --git a/logtail/filch/filch_windows.go b/logtail/filch/filch_windows.go
index 1dba9d50c..d60514bf0 100644
--- a/logtail/filch/filch_windows.go
+++ b/logtail/filch/filch_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filch
 
diff --git a/logtail/id.go b/logtail/id.go
index 3c1470612..ab07fc22c 100644
--- a/logtail/id.go
+++ b/logtail/id.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logtail
 
diff --git a/logtail/logtail.go b/logtail/logtail.go
index 85874304c..ac6bb38e9 100644
--- a/logtail/logtail.go
+++ b/logtail/logtail.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package logtail sends logs to log.tailscale.io.
 package logtail
diff --git a/logtail/logtail_test.go b/logtail/logtail_test.go
index c81e96ee8..d647e6fc9 100644
--- a/logtail/logtail_test.go
+++ b/logtail/logtail_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logtail
 
diff --git a/metrics/fds_linux.go b/metrics/fds_linux.go
index 10930f737..34740c2bb 100644
--- a/metrics/fds_linux.go
+++ b/metrics/fds_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package metrics
 
diff --git a/metrics/fds_notlinux.go b/metrics/fds_notlinux.go
index 50c7dfaf4..2dae97cad 100644
--- a/metrics/fds_notlinux.go
+++ b/metrics/fds_notlinux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux
 
diff --git a/metrics/metrics.go b/metrics/metrics.go
index bc19a1849..94d4a01ac 100644
--- a/metrics/metrics.go
+++ b/metrics/metrics.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package metrics contains expvar & Prometheus types and code used by
 // Tailscale for monitoring.
diff --git a/metrics/metrics_test.go b/metrics/metrics_test.go
index 6b9aa4366..1a2cf8d14 100644
--- a/metrics/metrics_test.go
+++ b/metrics/metrics_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package metrics
 
diff --git a/net/connstats/stats.go b/net/connstats/stats.go
index a17afd4f8..db3638a09 100644
--- a/net/connstats/stats.go
+++ b/net/connstats/stats.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package connstats maintains statistics about connections
 // flowing through a TUN device (which operate at the IP layer).
diff --git a/net/connstats/stats_test.go b/net/connstats/stats_test.go
index 936ff3836..a761e1584 100644
--- a/net/connstats/stats_test.go
+++ b/net/connstats/stats_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package connstats
 
diff --git a/net/dns/config.go b/net/dns/config.go
index a5f3984a7..9c55f6d73 100644
--- a/net/dns/config.go
+++ b/net/dns/config.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/debian_resolvconf.go b/net/dns/debian_resolvconf.go
index 2ebb33706..3ffc796e0 100644
--- a/net/dns/debian_resolvconf.go
+++ b/net/dns/debian_resolvconf.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || freebsd || openbsd
 
diff --git a/net/dns/direct.go b/net/dns/direct.go
index 01db328c8..0cae70d0e 100644
--- a/net/dns/direct.go
+++ b/net/dns/direct.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/direct_linux.go b/net/dns/direct_linux.go
index c4f774ac7..4a388c47b 100644
--- a/net/dns/direct_linux.go
+++ b/net/dns/direct_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/direct_notlinux.go b/net/dns/direct_notlinux.go
index 55635867c..c221ca1be 100644
--- a/net/dns/direct_notlinux.go
+++ b/net/dns/direct_notlinux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux
 
diff --git a/net/dns/direct_test.go b/net/dns/direct_test.go
index 399eac2eb..cb5aff51e 100644
--- a/net/dns/direct_test.go
+++ b/net/dns/direct_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/flush_default.go b/net/dns/flush_default.go
index 1c28851fc..eb6d9da41 100644
--- a/net/dns/flush_default.go
+++ b/net/dns/flush_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/net/dns/flush_windows.go b/net/dns/flush_windows.go
index 71da08e32..cefc06ffc 100644
--- a/net/dns/flush_windows.go
+++ b/net/dns/flush_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/ini.go b/net/dns/ini.go
index c8ae5f0cd..1e47d606e 100644
--- a/net/dns/ini.go
+++ b/net/dns/ini.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows
 
diff --git a/net/dns/ini_test.go b/net/dns/ini_test.go
index c7c9f8eeb..3afe7009c 100644
--- a/net/dns/ini_test.go
+++ b/net/dns/ini_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows
 
diff --git a/net/dns/manager.go b/net/dns/manager.go
index 1c51ad108..a4366d52d 100644
--- a/net/dns/manager.go
+++ b/net/dns/manager.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_darwin.go b/net/dns/manager_darwin.go
index 065bdd72a..2571cf8de 100644
--- a/net/dns/manager_darwin.go
+++ b/net/dns/manager_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_default.go b/net/dns/manager_default.go
index 8dfce78ab..41828ef82 100644
--- a/net/dns/manager_default.go
+++ b/net/dns/manager_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux && !freebsd && !openbsd && !windows && !darwin
 
diff --git a/net/dns/manager_freebsd.go b/net/dns/manager_freebsd.go
index 27a4e7fb4..534c1abc8 100644
--- a/net/dns/manager_freebsd.go
+++ b/net/dns/manager_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_linux.go b/net/dns/manager_linux.go
index 0e6d56a04..b61c36289 100644
--- a/net/dns/manager_linux.go
+++ b/net/dns/manager_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_linux_test.go b/net/dns/manager_linux_test.go
index 14a78c19c..edb9dc429 100644
--- a/net/dns/manager_linux_test.go
+++ b/net/dns/manager_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_openbsd.go b/net/dns/manager_openbsd.go
index e1611d3cc..b4e32b733 100644
--- a/net/dns/manager_openbsd.go
+++ b/net/dns/manager_openbsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_tcp_test.go b/net/dns/manager_tcp_test.go
index 0f886b214..719432ad0 100644
--- a/net/dns/manager_tcp_test.go
+++ b/net/dns/manager_tcp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_test.go b/net/dns/manager_test.go
index 17489c798..7997c4317 100644
--- a/net/dns/manager_test.go
+++ b/net/dns/manager_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_windows.go b/net/dns/manager_windows.go
index f77c45fe0..56ab32f45 100644
--- a/net/dns/manager_windows.go
+++ b/net/dns/manager_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/manager_windows_test.go b/net/dns/manager_windows_test.go
index ae0569d5b..722bae477 100644
--- a/net/dns/manager_windows_test.go
+++ b/net/dns/manager_windows_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/nm.go b/net/dns/nm.go
index 3ebfc535b..664297c63 100644
--- a/net/dns/nm.go
+++ b/net/dns/nm.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/dns/noop.go b/net/dns/noop.go
index f08ecc036..9466b57a0 100644
--- a/net/dns/noop.go
+++ b/net/dns/noop.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/nrpt_windows.go b/net/dns/nrpt_windows.go
index 42b156a27..f81cdb42f 100644
--- a/net/dns/nrpt_windows.go
+++ b/net/dns/nrpt_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/openresolv.go b/net/dns/openresolv.go
index 51cf43034..9c6f90074 100644
--- a/net/dns/openresolv.go
+++ b/net/dns/openresolv.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || freebsd || openbsd
 
diff --git a/net/dns/osconfig.go b/net/dns/osconfig.go
index 08be94e01..b12e6418b 100644
--- a/net/dns/osconfig.go
+++ b/net/dns/osconfig.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/osconfig_test.go b/net/dns/osconfig_test.go
index 4ad559af2..02b1cad9e 100644
--- a/net/dns/osconfig_test.go
+++ b/net/dns/osconfig_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/publicdns/publicdns.go b/net/dns/publicdns/publicdns.go
index 215cbef14..f089bcbc4 100644
--- a/net/dns/publicdns/publicdns.go
+++ b/net/dns/publicdns/publicdns.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package publicdns contains mapping and helpers for working with
 // public DNS providers.
diff --git a/net/dns/publicdns/publicdns_test.go b/net/dns/publicdns/publicdns_test.go
index 2246931e3..c4129a120 100644
--- a/net/dns/publicdns/publicdns_test.go
+++ b/net/dns/publicdns/publicdns_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package publicdns
 
diff --git a/net/dns/resolvconf-workaround.sh b/net/dns/resolvconf-workaround.sh
index f6f2690e2..aec6708a0 100644
--- a/net/dns/resolvconf-workaround.sh
+++ b/net/dns/resolvconf-workaround.sh
@@ -1,7 +1,6 @@
 #!/bin/sh
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 #
 # This script is a workaround for a vpn-unfriendly behavior of the
 # original resolvconf by Thomas Hood. Unlike the `openresolv`
diff --git a/net/dns/resolvconf.go b/net/dns/resolvconf.go
index b317b3bd4..0304375ee 100644
--- a/net/dns/resolvconf.go
+++ b/net/dns/resolvconf.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || freebsd || openbsd
 
diff --git a/net/dns/resolvconffile/resolvconffile.go b/net/dns/resolvconffile/resolvconffile.go
index 769ea1b42..914a5eb72 100644
--- a/net/dns/resolvconffile/resolvconffile.go
+++ b/net/dns/resolvconffile/resolvconffile.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package resolvconffile parses & serializes /etc/resolv.conf-style files.
 //
diff --git a/net/dns/resolvconffile/resolvconffile_test.go b/net/dns/resolvconffile/resolvconffile_test.go
index e5b5cc671..42bf09d66 100644
--- a/net/dns/resolvconffile/resolvconffile_test.go
+++ b/net/dns/resolvconffile/resolvconffile_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolvconffile
 
diff --git a/net/dns/resolvd.go b/net/dns/resolvd.go
index bc2b7de85..9b067eb07 100644
--- a/net/dns/resolvd.go
+++ b/net/dns/resolvd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build openbsd
 
diff --git a/net/dns/resolved.go b/net/dns/resolved.go
index 3b3838dc5..577d69ab7 100644
--- a/net/dns/resolved.go
+++ b/net/dns/resolved.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/dns/resolver/debug.go b/net/dns/resolver/debug.go
index 9a33f8856..f334af5c9 100644
--- a/net/dns/resolver/debug.go
+++ b/net/dns/resolver/debug.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolver
 
diff --git a/net/dns/resolver/doh_test.go b/net/dns/resolver/doh_test.go
index 3b93a9849..3b651e7f1 100644
--- a/net/dns/resolver/doh_test.go
+++ b/net/dns/resolver/doh_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolver
 
diff --git a/net/dns/resolver/forwarder.go b/net/dns/resolver/forwarder.go
index 17ad404d3..fd7437198 100644
--- a/net/dns/resolver/forwarder.go
+++ b/net/dns/resolver/forwarder.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolver
 
diff --git a/net/dns/resolver/forwarder_test.go b/net/dns/resolver/forwarder_test.go
index 1ce9d88f0..e11d6afad 100644
--- a/net/dns/resolver/forwarder_test.go
+++ b/net/dns/resolver/forwarder_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolver
 
diff --git a/net/dns/resolver/macios_ext.go b/net/dns/resolver/macios_ext.go
index 1e7101fdf..ee3efa666 100644
--- a/net/dns/resolver/macios_ext.go
+++ b/net/dns/resolver/macios_ext.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ts_macext && (darwin || ios)
 
diff --git a/net/dns/resolver/tsdns.go b/net/dns/resolver/tsdns.go
index 3a9684ebd..1baa7c522 100644
--- a/net/dns/resolver/tsdns.go
+++ b/net/dns/resolver/tsdns.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package resolver implements a stub DNS resolver that can also serve
 // records out of an internal local zone.
diff --git a/net/dns/resolver/tsdns_server_test.go b/net/dns/resolver/tsdns_server_test.go
index 72860b280..82fd3bebf 100644
--- a/net/dns/resolver/tsdns_server_test.go
+++ b/net/dns/resolver/tsdns_server_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolver
 
diff --git a/net/dns/resolver/tsdns_test.go b/net/dns/resolver/tsdns_test.go
index 5498a7d41..48242f61b 100644
--- a/net/dns/resolver/tsdns_test.go
+++ b/net/dns/resolver/tsdns_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package resolver
 
diff --git a/net/dns/utf.go b/net/dns/utf.go
index dc55590db..0c1db69ac 100644
--- a/net/dns/utf.go
+++ b/net/dns/utf.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/utf_test.go b/net/dns/utf_test.go
index fbe228248..b5fd37262 100644
--- a/net/dns/utf_test.go
+++ b/net/dns/utf_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dns/wsl_windows.go b/net/dns/wsl_windows.go
index 7a91f0064..8990fdcc7 100644
--- a/net/dns/wsl_windows.go
+++ b/net/dns/wsl_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
diff --git a/net/dnscache/dnscache.go b/net/dnscache/dnscache.go
index 94d97d273..52de322af 100644
--- a/net/dnscache/dnscache.go
+++ b/net/dnscache/dnscache.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // TODO(bradfitz): update this code to use netaddr more
 
diff --git a/net/dnscache/dnscache_test.go b/net/dnscache/dnscache_test.go
index f85142ff1..f143995ef 100644
--- a/net/dnscache/dnscache_test.go
+++ b/net/dnscache/dnscache_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dnscache
 
diff --git a/net/dnscache/messagecache.go b/net/dnscache/messagecache.go
index fe9fd117b..dc4a74e95 100644
--- a/net/dnscache/messagecache.go
+++ b/net/dnscache/messagecache.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dnscache
 
diff --git a/net/dnscache/messagecache_test.go b/net/dnscache/messagecache_test.go
index 3a699f586..3b52759f4 100644
--- a/net/dnscache/messagecache_test.go
+++ b/net/dnscache/messagecache_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dnscache
 
diff --git a/net/dnsfallback/dnsfallback.go b/net/dnsfallback/dnsfallback.go
index 6fedbd855..ed45e77b1 100644
--- a/net/dnsfallback/dnsfallback.go
+++ b/net/dnsfallback/dnsfallback.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:generate go run update-dns-fallbacks.go
 
diff --git a/net/dnsfallback/dnsfallback_test.go b/net/dnsfallback/dnsfallback_test.go
index 42c12b0b0..333b8b393 100644
--- a/net/dnsfallback/dnsfallback_test.go
+++ b/net/dnsfallback/dnsfallback_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dnsfallback
 
diff --git a/net/dnsfallback/update-dns-fallbacks.go b/net/dnsfallback/update-dns-fallbacks.go
index be3e92255..384e77e10 100644
--- a/net/dnsfallback/update-dns-fallbacks.go
+++ b/net/dnsfallback/update-dns-fallbacks.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ignore
 
diff --git a/net/flowtrack/flowtrack.go b/net/flowtrack/flowtrack.go
index 41b3bb9ab..85c7f2add 100644
--- a/net/flowtrack/flowtrack.go
+++ b/net/flowtrack/flowtrack.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 //
 // Original implementation (from same author) from which this was derived was:
 // https://github.com/golang/groupcache/blob/5b532d6fd5efaf7fa130d4e859a2fde0fc3a9e1b/lru/lru.go
diff --git a/net/flowtrack/flowtrack_test.go b/net/flowtrack/flowtrack_test.go
index cb71546f6..d50e3839b 100644
--- a/net/flowtrack/flowtrack_test.go
+++ b/net/flowtrack/flowtrack_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package flowtrack
 
diff --git a/net/interfaces/interfaces.go b/net/interfaces/interfaces.go
index e9bafe3b7..c9d92dfcb 100644
--- a/net/interfaces/interfaces.go
+++ b/net/interfaces/interfaces.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package interfaces contains helpers for looking up system network interfaces.
 package interfaces
diff --git a/net/interfaces/interfaces_bsd.go b/net/interfaces/interfaces_bsd.go
index 31f7e0d64..1a68e675d 100644
--- a/net/interfaces/interfaces_bsd.go
+++ b/net/interfaces/interfaces_bsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Common code for FreeBSD and Darwin. This might also work on other
 // BSD systems (e.g. OpenBSD) but has not been tested.
diff --git a/net/interfaces/interfaces_darwin.go b/net/interfaces/interfaces_darwin.go
index d0a7e8ef7..cc9df865d 100644
--- a/net/interfaces/interfaces_darwin.go
+++ b/net/interfaces/interfaces_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/interfaces/interfaces_darwin_test.go b/net/interfaces/interfaces_darwin_test.go
index 0216518f2..9c56df9bb 100644
--- a/net/interfaces/interfaces_darwin_test.go
+++ b/net/interfaces/interfaces_darwin_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/interfaces/interfaces_default_route_test.go b/net/interfaces/interfaces_default_route_test.go
index c1cc6aee5..4f81ed167 100644
--- a/net/interfaces/interfaces_default_route_test.go
+++ b/net/interfaces/interfaces_default_route_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || (darwin && !ts_macext)
 
diff --git a/net/interfaces/interfaces_defaultrouteif_todo.go b/net/interfaces/interfaces_defaultrouteif_todo.go
index d695ea057..c48ad246a 100644
--- a/net/interfaces/interfaces_defaultrouteif_todo.go
+++ b/net/interfaces/interfaces_defaultrouteif_todo.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux && !windows && !darwin && !freebsd
 
diff --git a/net/interfaces/interfaces_freebsd.go b/net/interfaces/interfaces_freebsd.go
index 4756840d8..ae2262c9d 100644
--- a/net/interfaces/interfaces_freebsd.go
+++ b/net/interfaces/interfaces_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This might work on other BSDs, but only tested on FreeBSD.
 
diff --git a/net/interfaces/interfaces_linux.go b/net/interfaces/interfaces_linux.go
index 316b5a951..41eb949df 100644
--- a/net/interfaces/interfaces_linux.go
+++ b/net/interfaces/interfaces_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/interfaces/interfaces_linux_test.go b/net/interfaces/interfaces_linux_test.go
index f59d6408a..87be5610f 100644
--- a/net/interfaces/interfaces_linux_test.go
+++ b/net/interfaces/interfaces_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/interfaces/interfaces_test.go b/net/interfaces/interfaces_test.go
index 7c1c135e6..752350ccb 100644
--- a/net/interfaces/interfaces_test.go
+++ b/net/interfaces/interfaces_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/interfaces/interfaces_windows.go b/net/interfaces/interfaces_windows.go
index c3a0c5e26..30b766130 100644
--- a/net/interfaces/interfaces_windows.go
+++ b/net/interfaces/interfaces_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/interfaces/interfaces_windows_test.go b/net/interfaces/interfaces_windows_test.go
index 8eaf26bd6..2092dae33 100644
--- a/net/interfaces/interfaces_windows_test.go
+++ b/net/interfaces/interfaces_windows_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package interfaces
 
diff --git a/net/netaddr/netaddr.go b/net/netaddr/netaddr.go
index c5515c544..1ab6c053a 100644
--- a/net/netaddr/netaddr.go
+++ b/net/netaddr/netaddr.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netaddr is a transitional package while we finish migrating from inet.af/netaddr
 // to Go 1.18's net/netip.
diff --git a/net/netcheck/netcheck.go b/net/netcheck/netcheck.go
index 5b2864991..2705bcb92 100644
--- a/net/netcheck/netcheck.go
+++ b/net/netcheck/netcheck.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netcheck checks the network conditions from the current host.
 package netcheck
diff --git a/net/netcheck/netcheck_test.go b/net/netcheck/netcheck_test.go
index 270ad3224..ab22040ce 100644
--- a/net/netcheck/netcheck_test.go
+++ b/net/netcheck/netcheck_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netcheck
 
diff --git a/net/neterror/neterror.go b/net/neterror/neterror.go
index 4224cc27a..c2d3269d5 100644
--- a/net/neterror/neterror.go
+++ b/net/neterror/neterror.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package neterror classifies network errors.
 package neterror
diff --git a/net/neterror/neterror_linux_test.go b/net/neterror/neterror_linux_test.go
index 70db5ff01..5b9906074 100644
--- a/net/neterror/neterror_linux_test.go
+++ b/net/neterror/neterror_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package neterror
 
diff --git a/net/neterror/neterror_windows.go b/net/neterror/neterror_windows.go
index 324e44fa2..bf112f5ed 100644
--- a/net/neterror/neterror_windows.go
+++ b/net/neterror/neterror_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package neterror
 
diff --git a/net/netknob/netknob.go b/net/netknob/netknob.go
index 9479ee898..53171f424 100644
--- a/net/netknob/netknob.go
+++ b/net/netknob/netknob.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netknob has Tailscale network knobs.
 package netknob
diff --git a/net/netns/netns.go b/net/netns/netns.go
index a5af26083..1502aad18 100644
--- a/net/netns/netns.go
+++ b/net/netns/netns.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netns contains the common code for using the Go net package
 // in a logical "network namespace" to avoid routing loops where
diff --git a/net/netns/netns_android.go b/net/netns/netns_android.go
index cfa88a517..218b132e3 100644
--- a/net/netns/netns_android.go
+++ b/net/netns/netns_android.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build android
 
diff --git a/net/netns/netns_darwin.go b/net/netns/netns_darwin.go
index 92ad266e9..22d7be434 100644
--- a/net/netns/netns_darwin.go
+++ b/net/netns/netns_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin
 
diff --git a/net/netns/netns_darwin_test.go b/net/netns/netns_darwin_test.go
index d9e4815b8..e1dc00b42 100644
--- a/net/netns/netns_darwin_test.go
+++ b/net/netns/netns_darwin_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netns
 
diff --git a/net/netns/netns_default.go b/net/netns/netns_default.go
index 17ebfd051..43a573959 100644
--- a/net/netns/netns_default.go
+++ b/net/netns/netns_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux && !windows && !darwin
 
diff --git a/net/netns/netns_linux.go b/net/netns/netns_linux.go
index dbbf8d46f..dea6a9e8d 100644
--- a/net/netns/netns_linux.go
+++ b/net/netns/netns_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux && !android
 
diff --git a/net/netns/netns_linux_test.go b/net/netns/netns_linux_test.go
index 38f989cea..5a6b1bbda 100644
--- a/net/netns/netns_linux_test.go
+++ b/net/netns/netns_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netns
 
diff --git a/net/netns/netns_test.go b/net/netns/netns_test.go
index ce8801f0c..d95c04981 100644
--- a/net/netns/netns_test.go
+++ b/net/netns/netns_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netns contains the common code for using the Go net package
 // in a logical "network namespace" to avoid routing loops where
diff --git a/net/netns/netns_windows.go b/net/netns/netns_windows.go
index 7cf2f614a..9b66935ff 100644
--- a/net/netns/netns_windows.go
+++ b/net/netns/netns_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netns
 
diff --git a/net/netns/socks.go b/net/netns/socks.go
index 7a4239ac1..eea69d865 100644
--- a/net/netns/socks.go
+++ b/net/netns/socks.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !js
 
diff --git a/net/netstat/netstat.go b/net/netstat/netstat.go
index cef2ba6b2..53c7d7757 100644
--- a/net/netstat/netstat.go
+++ b/net/netstat/netstat.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netstat returns the local machine's network connection table.
 package netstat
diff --git a/net/netstat/netstat_noimpl.go b/net/netstat/netstat_noimpl.go
index 82a2ef262..e455c8ce9 100644
--- a/net/netstat/netstat_noimpl.go
+++ b/net/netstat/netstat_noimpl.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/net/netstat/netstat_test.go b/net/netstat/netstat_test.go
index d75f2e777..38827df5e 100644
--- a/net/netstat/netstat_test.go
+++ b/net/netstat/netstat_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netstat
 
diff --git a/net/netstat/netstat_windows.go b/net/netstat/netstat_windows.go
index 25a00e1a8..8e39164e4 100644
--- a/net/netstat/netstat_windows.go
+++ b/net/netstat/netstat_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netstat returns the local machine's network connection table.
 package netstat
diff --git a/net/nettest/conn.go b/net/nettest/conn.go
index 5e26f8e41..0365464b3 100644
--- a/net/nettest/conn.go
+++ b/net/nettest/conn.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package nettest
 
diff --git a/net/nettest/conn_test.go b/net/nettest/conn_test.go
index 76c189198..9fb7f3e8a 100644
--- a/net/nettest/conn_test.go
+++ b/net/nettest/conn_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package nettest
 
diff --git a/net/nettest/listener.go b/net/nettest/listener.go
index 90f827328..0d39f490a 100644
--- a/net/nettest/listener.go
+++ b/net/nettest/listener.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package nettest
 
diff --git a/net/nettest/listener_test.go b/net/nettest/listener_test.go
index 09b7bed5f..9696a83be 100644
--- a/net/nettest/listener_test.go
+++ b/net/nettest/listener_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package nettest
 
diff --git a/net/nettest/pipe.go b/net/nettest/pipe.go
index 603e5feda..133b3cb89 100644
--- a/net/nettest/pipe.go
+++ b/net/nettest/pipe.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package nettest
 
diff --git a/net/nettest/pipe_test.go b/net/nettest/pipe_test.go
index 3661bc67e..f6252c713 100644
--- a/net/nettest/pipe_test.go
+++ b/net/nettest/pipe_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package nettest
 
diff --git a/net/netutil/ip_forward.go b/net/netutil/ip_forward.go
index 96cf9c444..da34491f5 100644
--- a/net/netutil/ip_forward.go
+++ b/net/netutil/ip_forward.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netutil contains misc shared networking code & types.
 package netutil
diff --git a/net/netutil/netutil.go b/net/netutil/netutil.go
index 0bca8b0b0..2a4e0d60e 100644
--- a/net/netutil/netutil.go
+++ b/net/netutil/netutil.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netutil contains misc shared networking code & types.
 package netutil
diff --git a/net/netutil/netutil_test.go b/net/netutil/netutil_test.go
index 5deb0d94d..6fad53412 100644
--- a/net/netutil/netutil_test.go
+++ b/net/netutil/netutil_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netutil
 
diff --git a/net/packet/doc.go b/net/packet/doc.go
index 9d76f736a..ce6c0c307 100644
--- a/net/packet/doc.go
+++ b/net/packet/doc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package packet contains packet parsing and marshaling utilities.
 //
diff --git a/net/packet/header.go b/net/packet/header.go
index b568ad6d4..dbe84429a 100644
--- a/net/packet/header.go
+++ b/net/packet/header.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/icmp.go b/net/packet/icmp.go
index bac3dd13f..89a7aaa32 100644
--- a/net/packet/icmp.go
+++ b/net/packet/icmp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/icmp4.go b/net/packet/icmp4.go
index da4774887..730239abf 100644
--- a/net/packet/icmp4.go
+++ b/net/packet/icmp4.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/icmp6.go b/net/packet/icmp6.go
index 1da5a1b4d..518746b55 100644
--- a/net/packet/icmp6.go
+++ b/net/packet/icmp6.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/icmp6_test.go b/net/packet/icmp6_test.go
index 067e8ab01..f34883ca4 100644
--- a/net/packet/icmp6_test.go
+++ b/net/packet/icmp6_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/ip4.go b/net/packet/ip4.go
index 2b9ccf8d4..967a8dba7 100644
--- a/net/packet/ip4.go
+++ b/net/packet/ip4.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/ip6.go b/net/packet/ip6.go
index f829f3f28..d26b9a161 100644
--- a/net/packet/ip6.go
+++ b/net/packet/ip6.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/packet.go b/net/packet/packet.go
index 5ec015ef3..aa71295c5 100644
--- a/net/packet/packet.go
+++ b/net/packet/packet.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/packet_test.go b/net/packet/packet_test.go
index dfce06610..9d6254f09 100644
--- a/net/packet/packet_test.go
+++ b/net/packet/packet_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/tsmp.go b/net/packet/tsmp.go
index 310378694..dc877f64d 100644
--- a/net/packet/tsmp.go
+++ b/net/packet/tsmp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // TSMP is our ICMP-like "Tailscale Message Protocol" for signaling
 // Tailscale-specific messages between nodes. It uses IP protocol 99
diff --git a/net/packet/tsmp_test.go b/net/packet/tsmp_test.go
index 9c074e7ad..e261e6a41 100644
--- a/net/packet/tsmp_test.go
+++ b/net/packet/tsmp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/udp4.go b/net/packet/udp4.go
index ce179f89d..0d5bca73e 100644
--- a/net/packet/udp4.go
+++ b/net/packet/udp4.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/packet/udp6.go b/net/packet/udp6.go
index ce776ee72..10fdcb99e 100644
--- a/net/packet/udp6.go
+++ b/net/packet/udp6.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package packet
 
diff --git a/net/ping/ping.go b/net/ping/ping.go
index 826d2d71f..f4bd7f0e0 100644
--- a/net/ping/ping.go
+++ b/net/ping/ping.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package ping allows sending ICMP echo requests to a host in order to
 // determine network latency.
diff --git a/net/ping/ping_test.go b/net/ping/ping_test.go
index 90baf0b88..1fdefc6e7 100644
--- a/net/ping/ping_test.go
+++ b/net/ping/ping_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ping
 
diff --git a/net/portmapper/disabled_stubs.go b/net/portmapper/disabled_stubs.go
index 4c5379e92..e08b54376 100644
--- a/net/portmapper/disabled_stubs.go
+++ b/net/portmapper/disabled_stubs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build js
 
diff --git a/net/portmapper/igd_test.go b/net/portmapper/igd_test.go
index bbfdd7ea8..ca5519871 100644
--- a/net/portmapper/igd_test.go
+++ b/net/portmapper/igd_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portmapper
 
diff --git a/net/portmapper/pcp.go b/net/portmapper/pcp.go
index 87fffff96..455b7f471 100644
--- a/net/portmapper/pcp.go
+++ b/net/portmapper/pcp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portmapper
 
diff --git a/net/portmapper/pcp_test.go b/net/portmapper/pcp_test.go
index a076c11ac..8f8eef3ef 100644
--- a/net/portmapper/pcp_test.go
+++ b/net/portmapper/pcp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portmapper
 
diff --git a/net/portmapper/pcpresultcode_string.go b/net/portmapper/pcpresultcode_string.go
index 91f4ac738..45eb70d39 100644
--- a/net/portmapper/pcpresultcode_string.go
+++ b/net/portmapper/pcpresultcode_string.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by "stringer -type=pcpResultCode -trimprefix=pcpCode"; DO NOT EDIT.
 
diff --git a/net/portmapper/pmpresultcode_string.go b/net/portmapper/pmpresultcode_string.go
index 01ce61fbc..603636ade 100644
--- a/net/portmapper/pmpresultcode_string.go
+++ b/net/portmapper/pmpresultcode_string.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by "stringer -type=pmpResultCode -trimprefix=pmpCode"; DO NOT EDIT.
 
diff --git a/net/portmapper/portmapper.go b/net/portmapper/portmapper.go
index 9b0ec5ca7..2e3fdacf1 100644
--- a/net/portmapper/portmapper.go
+++ b/net/portmapper/portmapper.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package portmapper is a UDP port mapping client. It currently allows for mapping over
 // NAT-PMP, UPnP, and PCP.
diff --git a/net/portmapper/portmapper_test.go b/net/portmapper/portmapper_test.go
index b8f328e25..23eb4b212 100644
--- a/net/portmapper/portmapper_test.go
+++ b/net/portmapper/portmapper_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portmapper
 
diff --git a/net/portmapper/upnp.go b/net/portmapper/upnp.go
index ceee6c8f3..80be74e7c 100644
--- a/net/portmapper/upnp.go
+++ b/net/portmapper/upnp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/net/portmapper/upnp_test.go b/net/portmapper/upnp_test.go
index 5e52ac456..227786505 100644
--- a/net/portmapper/upnp_test.go
+++ b/net/portmapper/upnp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portmapper
 
diff --git a/net/proxymux/mux.go b/net/proxymux/mux.go
index f16759c49..ff5aaff3b 100644
--- a/net/proxymux/mux.go
+++ b/net/proxymux/mux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package proxymux splits a net.Listener in two, routing SOCKS5
 // connections to one and HTTP requests to the other.
diff --git a/net/proxymux/mux_test.go b/net/proxymux/mux_test.go
index fd37eb136..fe6b51174 100644
--- a/net/proxymux/mux_test.go
+++ b/net/proxymux/mux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package proxymux
 
diff --git a/net/routetable/routetable.go b/net/routetable/routetable.go
index 83478b120..e5dce1cec 100644
--- a/net/routetable/routetable.go
+++ b/net/routetable/routetable.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package routetable provides functions that operate on the system's route
 // table.
diff --git a/net/routetable/routetable_bsd.go b/net/routetable/routetable_bsd.go
index c4c4810a3..602e139c4 100644
--- a/net/routetable/routetable_bsd.go
+++ b/net/routetable/routetable_bsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin || freebsd
 
diff --git a/net/routetable/routetable_bsd_test.go b/net/routetable/routetable_bsd_test.go
index eb87780ad..fc134617f 100644
--- a/net/routetable/routetable_bsd_test.go
+++ b/net/routetable/routetable_bsd_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin || freebsd
 
diff --git a/net/routetable/routetable_darwin.go b/net/routetable/routetable_darwin.go
index dc8e50853..672e3a15e 100644
--- a/net/routetable/routetable_darwin.go
+++ b/net/routetable/routetable_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin
 
diff --git a/net/routetable/routetable_freebsd.go b/net/routetable/routetable_freebsd.go
index ba4c68748..8e57a3302 100644
--- a/net/routetable/routetable_freebsd.go
+++ b/net/routetable/routetable_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build freebsd
 
diff --git a/net/routetable/routetable_linux.go b/net/routetable/routetable_linux.go
index e7347fe1a..d13e7d8be 100644
--- a/net/routetable/routetable_linux.go
+++ b/net/routetable/routetable_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/routetable/routetable_linux_test.go b/net/routetable/routetable_linux_test.go
index 5892fcf13..ebdb22d7f 100644
--- a/net/routetable/routetable_linux_test.go
+++ b/net/routetable/routetable_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/routetable/routetable_other.go b/net/routetable/routetable_other.go
index 4d16f28bd..35c83e374 100644
--- a/net/routetable/routetable_other.go
+++ b/net/routetable/routetable_other.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux && !darwin && !freebsd
 
diff --git a/net/socks5/socks5.go b/net/socks5/socks5.go
index 487ffcb1b..7e8749456 100644
--- a/net/socks5/socks5.go
+++ b/net/socks5/socks5.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package socks5 is a SOCKS5 server implementation.
 //
diff --git a/net/socks5/socks5_test.go b/net/socks5/socks5_test.go
index e05fed261..cbeffbff5 100644
--- a/net/socks5/socks5_test.go
+++ b/net/socks5/socks5_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package socks5
 
diff --git a/net/speedtest/speedtest.go b/net/speedtest/speedtest.go
index 8f7059b89..7ab0881cc 100644
--- a/net/speedtest/speedtest.go
+++ b/net/speedtest/speedtest.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package speedtest contains both server and client code for
 // running speedtests between tailscale nodes.
diff --git a/net/speedtest/speedtest_client.go b/net/speedtest/speedtest_client.go
index c62712908..299a12a8d 100644
--- a/net/speedtest/speedtest_client.go
+++ b/net/speedtest/speedtest_client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package speedtest
 
diff --git a/net/speedtest/speedtest_server.go b/net/speedtest/speedtest_server.go
index c83703194..9dd78b195 100644
--- a/net/speedtest/speedtest_server.go
+++ b/net/speedtest/speedtest_server.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package speedtest
 
diff --git a/net/speedtest/speedtest_test.go b/net/speedtest/speedtest_test.go
index cdcd51e5b..55dcbeea1 100644
--- a/net/speedtest/speedtest_test.go
+++ b/net/speedtest/speedtest_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package speedtest
 
diff --git a/net/stun/stun.go b/net/stun/stun.go
index 1acb8bf1b..06f25c8bf 100644
--- a/net/stun/stun.go
+++ b/net/stun/stun.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package STUN generates STUN request packets and parses response packets.
 package stun
diff --git a/net/stun/stun_fuzzer.go b/net/stun/stun_fuzzer.go
index 6bb66e8a9..6f0c9e3b0 100644
--- a/net/stun/stun_fuzzer.go
+++ b/net/stun/stun_fuzzer.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 //go:build gofuzz
 
 package stun
diff --git a/net/stun/stun_test.go b/net/stun/stun_test.go
index 30922ed9c..d5cb27222 100644
--- a/net/stun/stun_test.go
+++ b/net/stun/stun_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package stun_test
 
diff --git a/net/stun/stuntest/stuntest.go b/net/stun/stuntest/stuntest.go
index 1b3ae5ba8..3c955c344 100644
--- a/net/stun/stuntest/stuntest.go
+++ b/net/stun/stuntest/stuntest.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package stuntest provides a STUN test server.
 package stuntest
diff --git a/net/tlsdial/deps_test.go b/net/tlsdial/deps_test.go
index 6a74d7dc0..7a93899c2 100644
--- a/net/tlsdial/deps_test.go
+++ b/net/tlsdial/deps_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build for_go_mod_tidy_only
 
diff --git a/net/tlsdial/tlsdial.go b/net/tlsdial/tlsdial.go
index f8966ce94..4a3f420b4 100644
--- a/net/tlsdial/tlsdial.go
+++ b/net/tlsdial/tlsdial.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tlsdial originally existed to set up a tls.Config for x509
 // validation, using a memory-optimized path for iOS, but then we
diff --git a/net/tlsdial/tlsdial_test.go b/net/tlsdial/tlsdial_test.go
index 99267fb16..7aaf3b36a 100644
--- a/net/tlsdial/tlsdial_test.go
+++ b/net/tlsdial/tlsdial_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tlsdial
 
diff --git a/net/tsaddr/tsaddr.go b/net/tsaddr/tsaddr.go
index f2a5b4430..6b8d11f9d 100644
--- a/net/tsaddr/tsaddr.go
+++ b/net/tsaddr/tsaddr.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tsaddr handles Tailscale-specific IPs and ranges.
 package tsaddr
diff --git a/net/tsaddr/tsaddr_test.go b/net/tsaddr/tsaddr_test.go
index 60d79f42a..e74502005 100644
--- a/net/tsaddr/tsaddr_test.go
+++ b/net/tsaddr/tsaddr_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsaddr
 
diff --git a/net/tsdial/dnsmap.go b/net/tsdial/dnsmap.go
index f98cb6011..52b8e6d81 100644
--- a/net/tsdial/dnsmap.go
+++ b/net/tsdial/dnsmap.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsdial
 
diff --git a/net/tsdial/dnsmap_test.go b/net/tsdial/dnsmap_test.go
index afa315cfe..0712b6d0d 100644
--- a/net/tsdial/dnsmap_test.go
+++ b/net/tsdial/dnsmap_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsdial
 
diff --git a/net/tsdial/dohclient.go b/net/tsdial/dohclient.go
index 352fdb4cd..d830398cd 100644
--- a/net/tsdial/dohclient.go
+++ b/net/tsdial/dohclient.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsdial
 
diff --git a/net/tsdial/dohclient_test.go b/net/tsdial/dohclient_test.go
index eeffac76a..23255769f 100644
--- a/net/tsdial/dohclient_test.go
+++ b/net/tsdial/dohclient_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsdial
 
diff --git a/net/tsdial/peerapi_macios_ext.go b/net/tsdial/peerapi_macios_ext.go
index 47e8b36a3..82fce759e 100644
--- a/net/tsdial/peerapi_macios_ext.go
+++ b/net/tsdial/peerapi_macios_ext.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This file's built on iOS and on two of three macOS build variants:
 // the two GUI variants that both use Extensions (Network Extension
diff --git a/net/tsdial/tsdial.go b/net/tsdial/tsdial.go
index 18e83b720..ffdbec234 100644
--- a/net/tsdial/tsdial.go
+++ b/net/tsdial/tsdial.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tsdial provides a Dialer type that can dial out of tailscaled.
 package tsdial
diff --git a/net/tshttpproxy/mksyscall.go b/net/tshttpproxy/mksyscall.go
index 2989748e5..f8fdae89b 100644
--- a/net/tshttpproxy/mksyscall.go
+++ b/net/tshttpproxy/mksyscall.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tshttpproxy
 
diff --git a/net/tshttpproxy/tshttpproxy.go b/net/tshttpproxy/tshttpproxy.go
index 990789d3b..32f6e18ad 100644
--- a/net/tshttpproxy/tshttpproxy.go
+++ b/net/tshttpproxy/tshttpproxy.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tshttpproxy contains Tailscale additions to httpproxy not available
 // in golang.org/x/net/http/httpproxy. Notably, it aims to support Windows better.
diff --git a/net/tshttpproxy/tshttpproxy_future.go b/net/tshttpproxy/tshttpproxy_future.go
index dbb6f23cc..56c9eca15 100644
--- a/net/tshttpproxy/tshttpproxy_future.go
+++ b/net/tshttpproxy/tshttpproxy_future.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build tailscale_go
 
diff --git a/net/tshttpproxy/tshttpproxy_linux.go b/net/tshttpproxy/tshttpproxy_linux.go
index f82fe0878..b241c256d 100644
--- a/net/tshttpproxy/tshttpproxy_linux.go
+++ b/net/tshttpproxy/tshttpproxy_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/tshttpproxy/tshttpproxy_synology.go b/net/tshttpproxy/tshttpproxy_synology.go
index f9ff6a999..cda957648 100644
--- a/net/tshttpproxy/tshttpproxy_synology.go
+++ b/net/tshttpproxy/tshttpproxy_synology.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/tshttpproxy/tshttpproxy_synology_test.go b/net/tshttpproxy/tshttpproxy_synology_test.go
index 2a7798923..2eae348ae 100644
--- a/net/tshttpproxy/tshttpproxy_synology_test.go
+++ b/net/tshttpproxy/tshttpproxy_synology_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/net/tshttpproxy/tshttpproxy_test.go b/net/tshttpproxy/tshttpproxy_test.go
index 88e390847..6f86df958 100644
--- a/net/tshttpproxy/tshttpproxy_test.go
+++ b/net/tshttpproxy/tshttpproxy_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tshttpproxy
 
diff --git a/net/tshttpproxy/tshttpproxy_windows.go b/net/tshttpproxy/tshttpproxy_windows.go
index 17a229872..06a1f5ae4 100644
--- a/net/tshttpproxy/tshttpproxy_windows.go
+++ b/net/tshttpproxy/tshttpproxy_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tshttpproxy
 
diff --git a/net/tstun/constants.go b/net/tstun/constants.go
index c93148e2b..656eff7ac 100644
--- a/net/tstun/constants.go
+++ b/net/tstun/constants.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/tstun/fake.go b/net/tstun/fake.go
index e113064c6..4bf29d093 100644
--- a/net/tstun/fake.go
+++ b/net/tstun/fake.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/tstun/ifstatus_noop.go b/net/tstun/ifstatus_noop.go
index 30840e11a..8cf569f98 100644
--- a/net/tstun/ifstatus_noop.go
+++ b/net/tstun/ifstatus_noop.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/net/tstun/ifstatus_windows.go b/net/tstun/ifstatus_windows.go
index dc0e4a24d..fd9fc2112 100644
--- a/net/tstun/ifstatus_windows.go
+++ b/net/tstun/ifstatus_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/tstun/linkattrs_linux.go b/net/tstun/linkattrs_linux.go
index 434c9815b..681e79269 100644
--- a/net/tstun/linkattrs_linux.go
+++ b/net/tstun/linkattrs_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/tstun/linkattrs_notlinux.go b/net/tstun/linkattrs_notlinux.go
index c01befdf2..7a7b40fc2 100644
--- a/net/tstun/linkattrs_notlinux.go
+++ b/net/tstun/linkattrs_notlinux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux
 
diff --git a/net/tstun/tap_linux.go b/net/tstun/tap_linux.go
index fa5917f5c..7dcb5ee5d 100644
--- a/net/tstun/tap_linux.go
+++ b/net/tstun/tap_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ts_omit_tap
 
diff --git a/net/tstun/tap_unsupported.go b/net/tstun/tap_unsupported.go
index 186813349..6792b229f 100644
--- a/net/tstun/tap_unsupported.go
+++ b/net/tstun/tap_unsupported.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux || ts_omit_tap
 
diff --git a/net/tstun/tun.go b/net/tstun/tun.go
index 90a865f81..37660b657 100644
--- a/net/tstun/tun.go
+++ b/net/tstun/tun.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/net/tstun/tun_linux.go b/net/tstun/tun_linux.go
index 112d16b85..9600ceb77 100644
--- a/net/tstun/tun_linux.go
+++ b/net/tstun/tun_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/tstun/tun_macos.go b/net/tstun/tun_macos.go
index e72d2ecd0..3506f05b1 100644
--- a/net/tstun/tun_macos.go
+++ b/net/tstun/tun_macos.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin && !ios
 
diff --git a/net/tstun/tun_notwindows.go b/net/tstun/tun_notwindows.go
index 934f50bf7..087fcd4ee 100644
--- a/net/tstun/tun_notwindows.go
+++ b/net/tstun/tun_notwindows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/net/tstun/tun_windows.go b/net/tstun/tun_windows.go
index eb30e63d1..2b1d3054e 100644
--- a/net/tstun/tun_windows.go
+++ b/net/tstun/tun_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/tstun/wrap.go b/net/tstun/wrap.go
index 23dcda15d..54dc2874f 100644
--- a/net/tstun/wrap.go
+++ b/net/tstun/wrap.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tstun provides a TUN struct implementing the tun.Device interface
 // with additional features as required by wgengine.
diff --git a/net/tstun/wrap_test.go b/net/tstun/wrap_test.go
index f616ebebe..6faccf169 100644
--- a/net/tstun/wrap_test.go
+++ b/net/tstun/wrap_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstun
 
diff --git a/net/wsconn/wsconn.go b/net/wsconn/wsconn.go
index e846aad51..697b66ddd 100644
--- a/net/wsconn/wsconn.go
+++ b/net/wsconn/wsconn.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package wsconn contains an adapter type that turns
 // a websocket connection into a net.Conn. It a temporary fork of the
diff --git a/packages/deb/deb.go b/packages/deb/deb.go
index f53909cc4..30e3f2b4d 100644
--- a/packages/deb/deb.go
+++ b/packages/deb/deb.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package deb extracts metadata from Debian packages.
 package deb
diff --git a/packages/deb/deb_test.go b/packages/deb/deb_test.go
index e22b718d6..fe3a358db 100644
--- a/packages/deb/deb_test.go
+++ b/packages/deb/deb_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package deb
 
diff --git a/paths/migrate.go b/paths/migrate.go
index 94f340678..3a23ecca3 100644
--- a/paths/migrate.go
+++ b/paths/migrate.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package paths
 
diff --git a/paths/paths.go b/paths/paths.go
index b13dfd51f..343692f20 100644
--- a/paths/paths.go
+++ b/paths/paths.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package paths returns platform and user-specific default paths to
 // Tailscale files and directories.
diff --git a/paths/paths_js.go b/paths/paths_js.go
index 9de230258..81e9f1540 100644
--- a/paths/paths_js.go
+++ b/paths/paths_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package paths
 
diff --git a/paths/paths_unix.go b/paths/paths_unix.go
index e011c74e4..e4e743476 100644
--- a/paths/paths_unix.go
+++ b/paths/paths_unix.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !js
 
diff --git a/paths/paths_windows.go b/paths/paths_windows.go
index 03fbbac73..aa31e6f6e 100644
--- a/paths/paths_windows.go
+++ b/paths/paths_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package paths
 
diff --git a/portlist/clean.go b/portlist/clean.go
index 9473c39e2..7e137de94 100644
--- a/portlist/clean.go
+++ b/portlist/clean.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portlist
 
diff --git a/portlist/clean_test.go b/portlist/clean_test.go
index 2778d249f..5a1e34405 100644
--- a/portlist/clean_test.go
+++ b/portlist/clean_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portlist
 
diff --git a/portlist/netstat.go b/portlist/netstat.go
index e0a25cbe3..132367ca9 100644
--- a/portlist/netstat.go
+++ b/portlist/netstat.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin && !ios
 
diff --git a/portlist/netstat_test.go b/portlist/netstat_test.go
index 29a74b1c6..c24f8732e 100644
--- a/portlist/netstat_test.go
+++ b/portlist/netstat_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin && !ios
 
diff --git a/portlist/poller.go b/portlist/poller.go
index 5a3c5448b..2492382a5 100644
--- a/portlist/poller.go
+++ b/portlist/poller.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This file contains the code related to the Poller type and its methods.
 // The hot loop to keep efficient is Poller.Run.
diff --git a/portlist/portlist.go b/portlist/portlist.go
index fe4a1af4d..dd200d191 100644
--- a/portlist/portlist.go
+++ b/portlist/portlist.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This file is just the types. The bulk of the code is in poller.go.
 
diff --git a/portlist/portlist_linux.go b/portlist/portlist_linux.go
index 859270da8..ce20866f0 100644
--- a/portlist/portlist_linux.go
+++ b/portlist/portlist_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portlist
 
diff --git a/portlist/portlist_linux_test.go b/portlist/portlist_linux_test.go
index a40ec097b..60a3626e6 100644
--- a/portlist/portlist_linux_test.go
+++ b/portlist/portlist_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portlist
 
diff --git a/portlist/portlist_macos.go b/portlist/portlist_macos.go
index 515056d32..13df1c173 100644
--- a/portlist/portlist_macos.go
+++ b/portlist/portlist_macos.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin && !ios
 
diff --git a/portlist/portlist_test.go b/portlist/portlist_test.go
index a50496aeb..930ce8a9b 100644
--- a/portlist/portlist_test.go
+++ b/portlist/portlist_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portlist
 
diff --git a/portlist/portlist_windows.go b/portlist/portlist_windows.go
index c79461ef2..1706e612f 100644
--- a/portlist/portlist_windows.go
+++ b/portlist/portlist_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package portlist
 
diff --git a/prober/derp.go b/prober/derp.go
index 68bbd1f26..e5c07a8d2 100644
--- a/prober/derp.go
+++ b/prober/derp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/derp_test.go b/prober/derp_test.go
index 7ae54f9a1..1f8db523c 100644
--- a/prober/derp_test.go
+++ b/prober/derp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/http.go b/prober/http.go
index 6aeb8f328..c3172a132 100644
--- a/prober/http.go
+++ b/prober/http.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/notification.go b/prober/notification.go
index 750416ce5..c62580f98 100644
--- a/prober/notification.go
+++ b/prober/notification.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/prober.go b/prober/prober.go
index 071e8d3cf..46956b4e5 100644
--- a/prober/prober.go
+++ b/prober/prober.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package prober implements a simple blackbox prober. Each probe runs
 // in its own goroutine, and run results are recorded as Prometheus
diff --git a/prober/prober_test.go b/prober/prober_test.go
index 838f461ec..29b6473c8 100644
--- a/prober/prober_test.go
+++ b/prober/prober_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/tcp.go b/prober/tcp.go
index c6f2a6f73..9f35a2697 100644
--- a/prober/tcp.go
+++ b/prober/tcp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/tls.go b/prober/tls.go
index 1f221b9ce..97c53298e 100644
--- a/prober/tls.go
+++ b/prober/tls.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/prober/tls_test.go b/prober/tls_test.go
index 444710439..6c6601ee0 100644
--- a/prober/tls_test.go
+++ b/prober/tls_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package prober
 
diff --git a/safesocket/basic_test.go b/safesocket/basic_test.go
index bcdd2a397..a70d5a872 100644
--- a/safesocket/basic_test.go
+++ b/safesocket/basic_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package safesocket
 
diff --git a/safesocket/pipe_windows.go b/safesocket/pipe_windows.go
index 2851a0b2f..2718cfd9e 100644
--- a/safesocket/pipe_windows.go
+++ b/safesocket/pipe_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package safesocket
 
diff --git a/safesocket/safesocket.go b/safesocket/safesocket.go
index c27834a67..243c4bfcb 100644
--- a/safesocket/safesocket.go
+++ b/safesocket/safesocket.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package safesocket creates either a Unix socket, if possible, or
 // otherwise a localhost TCP connection.
diff --git a/safesocket/safesocket_darwin.go b/safesocket/safesocket_darwin.go
index 7d0001f5e..f72570890 100644
--- a/safesocket/safesocket_darwin.go
+++ b/safesocket/safesocket_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package safesocket
 
diff --git a/safesocket/safesocket_js.go b/safesocket/safesocket_js.go
index fadf81a43..5e0fe8092 100644
--- a/safesocket/safesocket_js.go
+++ b/safesocket/safesocket_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package safesocket
 
diff --git a/safesocket/safesocket_ps.go b/safesocket/safesocket_ps.go
index 5db1c0ece..f7d97f7fd 100644
--- a/safesocket/safesocket_ps.go
+++ b/safesocket/safesocket_ps.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || windows || darwin || freebsd
 
diff --git a/safesocket/safesocket_test.go b/safesocket/safesocket_test.go
index 4b39c11cd..3f36a1cf6 100644
--- a/safesocket/safesocket_test.go
+++ b/safesocket/safesocket_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package safesocket
 
diff --git a/safesocket/unixsocket.go b/safesocket/unixsocket.go
index 72649a87e..c205f4ea8 100644
--- a/safesocket/unixsocket.go
+++ b/safesocket/unixsocket.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !js
 
diff --git a/scripts/check_license_headers.sh b/scripts/check_license_headers.sh
index b2151fd33..8b9cbbc30 100755
--- a/scripts/check_license_headers.sh
+++ b/scripts/check_license_headers.sh
@@ -1,8 +1,7 @@
 #!/bin/sh
 #
-# Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 #
 # check_license_headers.sh checks that all Go files in the given
 # directory tree have a correct-looking Tailscale license header.
diff --git a/scripts/installer.sh b/scripts/installer.sh
index 406b32d45..e7648b414 100755
--- a/scripts/installer.sh
+++ b/scripts/installer.sh
@@ -1,7 +1,6 @@
 #!/bin/sh
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
 #
 # This script detects the current operating system, and installs
 # Tailscale according to that OS's conventions.
diff --git a/smallzstd/zstd.go b/smallzstd/zstd.go
index 3e49e804e..1d8085422 100644
--- a/smallzstd/zstd.go
+++ b/smallzstd/zstd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package smallzstd produces zstd encoders and decoders optimized for
 // low memory usage, at the expense of compression efficiency.
diff --git a/smallzstd/zstd_test.go b/smallzstd/zstd_test.go
index 3944577d2..489c518ae 100644
--- a/smallzstd/zstd_test.go
+++ b/smallzstd/zstd_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package smallzstd
 
diff --git a/ssh/tailssh/context.go b/ssh/tailssh/context.go
index 4effaa3e0..de3886da4 100644
--- a/ssh/tailssh/context.go
+++ b/ssh/tailssh/context.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailssh
 
diff --git a/ssh/tailssh/incubator.go b/ssh/tailssh/incubator.go
index e14d541d4..a21c23d30 100644
--- a/ssh/tailssh/incubator.go
+++ b/ssh/tailssh/incubator.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This file contains the code for the incubator process.  Tailscaled
 // launches the incubator as the same user as it was launched as.  The
diff --git a/ssh/tailssh/incubator_linux.go b/ssh/tailssh/incubator_linux.go
index 205a071bb..f9abdb272 100644
--- a/ssh/tailssh/incubator_linux.go
+++ b/ssh/tailssh/incubator_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/ssh/tailssh/tailssh.go b/ssh/tailssh/tailssh.go
index 4710ac5c8..f4167ffbe 100644
--- a/ssh/tailssh/tailssh.go
+++ b/ssh/tailssh/tailssh.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || (darwin && !ios) || freebsd || openbsd
 
diff --git a/ssh/tailssh/tailssh_test.go b/ssh/tailssh/tailssh_test.go
index c5e019da1..2dec08ea7 100644
--- a/ssh/tailssh/tailssh_test.go
+++ b/ssh/tailssh/tailssh_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux || darwin
 
diff --git a/syncs/locked.go b/syncs/locked.go
index e7b5ec311..d2048665d 100644
--- a/syncs/locked.go
+++ b/syncs/locked.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package syncs
 
diff --git a/syncs/locked_test.go b/syncs/locked_test.go
index 7a06f413d..90b36e832 100644
--- a/syncs/locked_test.go
+++ b/syncs/locked_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build go1.13 && !go1.19
 
diff --git a/syncs/syncs.go b/syncs/syncs.go
index fd565fbbe..4d2891e3a 100644
--- a/syncs/syncs.go
+++ b/syncs/syncs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package syncs contains additional sync types and functionality.
 package syncs
diff --git a/syncs/syncs_test.go b/syncs/syncs_test.go
index 632cae64f..3532d84f6 100644
--- a/syncs/syncs_test.go
+++ b/syncs/syncs_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package syncs
 
diff --git a/syncs/watchdog.go b/syncs/watchdog.go
index ba5f0816b..f4042644d 100644
--- a/syncs/watchdog.go
+++ b/syncs/watchdog.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package syncs
 
diff --git a/syncs/watchdog_test.go b/syncs/watchdog_test.go
index 07b03283a..11c51337a 100644
--- a/syncs/watchdog_test.go
+++ b/syncs/watchdog_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package syncs
 
diff --git a/tailcfg/c2ntypes.go b/tailcfg/c2ntypes.go
index 3212eaa5f..0578299d7 100644
--- a/tailcfg/c2ntypes.go
+++ b/tailcfg/c2ntypes.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // c2n (control-to-node) API types.
 
diff --git a/tailcfg/derpmap.go b/tailcfg/derpmap.go
index 998842dcb..1a22e8880 100644
--- a/tailcfg/derpmap.go
+++ b/tailcfg/derpmap.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailcfg
 
diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go
index a58ec3624..9b8905647 100644
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailcfg
 
diff --git a/tailcfg/tailcfg_clone.go b/tailcfg/tailcfg_clone.go
index 0160f5f26..689b57771 100644
--- a/tailcfg/tailcfg_clone.go
+++ b/tailcfg/tailcfg_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/tailcfg/tailcfg_export_test.go b/tailcfg/tailcfg_export_test.go
index 9cb18425e..11d68fa84 100644
--- a/tailcfg/tailcfg_export_test.go
+++ b/tailcfg/tailcfg_export_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailcfg
 
diff --git a/tailcfg/tailcfg_test.go b/tailcfg/tailcfg_test.go
index c207ed6e8..34cba3e79 100644
--- a/tailcfg/tailcfg_test.go
+++ b/tailcfg/tailcfg_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailcfg_test
 
diff --git a/tailcfg/tailcfg_view.go b/tailcfg/tailcfg_view.go
index 1ebc9c5ce..463cc3620 100644
--- a/tailcfg/tailcfg_view.go
+++ b/tailcfg/tailcfg_view.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale/cmd/viewer; DO NOT EDIT.
 
diff --git a/tailcfg/tka.go b/tailcfg/tka.go
index 6ce0b7cf5..890dfa325 100644
--- a/tailcfg/tka.go
+++ b/tailcfg/tka.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailcfg
 
diff --git a/tka/aum.go b/tka/aum.go
index bab9cf634..d21ca199b 100644
--- a/tka/aum.go
+++ b/tka/aum.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/aum_test.go b/tka/aum_test.go
index f09357104..4297efabf 100644
--- a/tka/aum_test.go
+++ b/tka/aum_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/builder.go b/tka/builder.go
index 332f5f019..c14ba2330 100644
--- a/tka/builder.go
+++ b/tka/builder.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/builder_test.go b/tka/builder_test.go
index 52a5e95c9..666af9ad0 100644
--- a/tka/builder_test.go
+++ b/tka/builder_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/chaintest_test.go b/tka/chaintest_test.go
index bd1e094d1..9040173a4 100644
--- a/tka/chaintest_test.go
+++ b/tka/chaintest_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/key.go b/tka/key.go
index 258cc44a2..619fc5f4a 100644
--- a/tka/key.go
+++ b/tka/key.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/key_test.go b/tka/key_test.go
index e8adc9dd0..e912f89c4 100644
--- a/tka/key_test.go
+++ b/tka/key_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/scenario_test.go b/tka/scenario_test.go
index 76d98962b..d24aa4cea 100644
--- a/tka/scenario_test.go
+++ b/tka/scenario_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/sig.go b/tka/sig.go
index 368fb96ad..f31738f1e 100644
--- a/tka/sig.go
+++ b/tka/sig.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/sig_test.go b/tka/sig_test.go
index 22addf9c1..038ec5f88 100644
--- a/tka/sig_test.go
+++ b/tka/sig_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/state.go b/tka/state.go
index 3a13a1c48..85c92add4 100644
--- a/tka/state.go
+++ b/tka/state.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/state_test.go b/tka/state_test.go
index a5f9a99c5..9c99ab560 100644
--- a/tka/state_test.go
+++ b/tka/state_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/sync.go b/tka/sync.go
index 2594059e0..b6f3f31b0 100644
--- a/tka/sync.go
+++ b/tka/sync.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/sync_test.go b/tka/sync_test.go
index 2e5e31de5..7250eacf7 100644
--- a/tka/sync_test.go
+++ b/tka/sync_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/tailchonk.go b/tka/tailchonk.go
index 46510bead..75ac70977 100644
--- a/tka/tailchonk.go
+++ b/tka/tailchonk.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/tailchonk_test.go b/tka/tailchonk_test.go
index af8aade3f..cf78d2185 100644
--- a/tka/tailchonk_test.go
+++ b/tka/tailchonk_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tka/tka.go b/tka/tka.go
index 2692930af..7f714ec4f 100644
--- a/tka/tka.go
+++ b/tka/tka.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tka (WIP) implements the Tailnet Key Authority.
 package tka
diff --git a/tka/tka_test.go b/tka/tka_test.go
index bbfe6edf2..11d10bac6 100644
--- a/tka/tka_test.go
+++ b/tka/tka_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tka
 
diff --git a/tsconst/interface.go b/tsconst/interface.go
index f2f67a398..f64e290a9 100644
--- a/tsconst/interface.go
+++ b/tsconst/interface.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tsconst exports some constants used elsewhere in the
 // codebase.
diff --git a/tsnet/example/tshello/tshello.go b/tsnet/example/tshello/tshello.go
index ae60d9dbf..0cadcdd83 100644
--- a/tsnet/example/tshello/tshello.go
+++ b/tsnet/example/tshello/tshello.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The tshello server demonstrates how to use Tailscale as a library.
 package main
diff --git a/tsnet/example/tsnet-http-client/tsnet-http-client.go b/tsnet/example/tsnet-http-client/tsnet-http-client.go
index 1d72ee17c..9666fe999 100644
--- a/tsnet/example/tsnet-http-client/tsnet-http-client.go
+++ b/tsnet/example/tsnet-http-client/tsnet-http-client.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The tshello server demonstrates how to use Tailscale as a library.
 package main
diff --git a/tsnet/tsnet.go b/tsnet/tsnet.go
index 774340b23..b1a7b9259 100644
--- a/tsnet/tsnet.go
+++ b/tsnet/tsnet.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tsnet provides Tailscale as a library.
 //
diff --git a/tsnet/tsnet_test.go b/tsnet/tsnet_test.go
index 35110d9ab..26f7cf117 100644
--- a/tsnet/tsnet_test.go
+++ b/tsnet/tsnet_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsnet
 
diff --git a/tstest/allocs.go b/tstest/allocs.go
index 4ffd8a66d..f15a00508 100644
--- a/tstest/allocs.go
+++ b/tstest/allocs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstest
 
diff --git a/tstest/archtest/archtest_test.go b/tstest/archtest/archtest_test.go
index da5e0c5af..900145dc0 100644
--- a/tstest/archtest/archtest_test.go
+++ b/tstest/archtest/archtest_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package archtest
 
diff --git a/tstest/archtest/qemu_test.go b/tstest/archtest/qemu_test.go
index 89a2f78f2..8b59ae5d9 100644
--- a/tstest/archtest/qemu_test.go
+++ b/tstest/archtest/qemu_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux && amd64 && !race
 
diff --git a/tstest/clock.go b/tstest/clock.go
index 296d0402c..fb7d4ea70 100644
--- a/tstest/clock.go
+++ b/tstest/clock.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstest
 
diff --git a/tstest/integration/gen_deps.go b/tstest/integration/gen_deps.go
index 26330f228..d31f175d6 100644
--- a/tstest/integration/gen_deps.go
+++ b/tstest/integration/gen_deps.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ignore
 
diff --git a/tstest/integration/integration.go b/tstest/integration/integration.go
index f6dbb3a85..560913596 100644
--- a/tstest/integration/integration.go
+++ b/tstest/integration/integration.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package integration contains Tailscale integration tests.
 //
diff --git a/tstest/integration/integration_test.go b/tstest/integration/integration_test.go
index a10c7b9a6..fded74855 100644
--- a/tstest/integration/integration_test.go
+++ b/tstest/integration/integration_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package integration
 
diff --git a/tstest/integration/tailscaled_deps_test_darwin.go b/tstest/integration/tailscaled_deps_test_darwin.go
index 7056b3abf..66a04dc6a 100644
--- a/tstest/integration/tailscaled_deps_test_darwin.go
+++ b/tstest/integration/tailscaled_deps_test_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by gen_deps.go; DO NOT EDIT.
 
diff --git a/tstest/integration/tailscaled_deps_test_freebsd.go b/tstest/integration/tailscaled_deps_test_freebsd.go
index 7056b3abf..66a04dc6a 100644
--- a/tstest/integration/tailscaled_deps_test_freebsd.go
+++ b/tstest/integration/tailscaled_deps_test_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by gen_deps.go; DO NOT EDIT.
 
diff --git a/tstest/integration/tailscaled_deps_test_linux.go b/tstest/integration/tailscaled_deps_test_linux.go
index 7056b3abf..66a04dc6a 100644
--- a/tstest/integration/tailscaled_deps_test_linux.go
+++ b/tstest/integration/tailscaled_deps_test_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by gen_deps.go; DO NOT EDIT.
 
diff --git a/tstest/integration/tailscaled_deps_test_openbsd.go b/tstest/integration/tailscaled_deps_test_openbsd.go
index 7056b3abf..66a04dc6a 100644
--- a/tstest/integration/tailscaled_deps_test_openbsd.go
+++ b/tstest/integration/tailscaled_deps_test_openbsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by gen_deps.go; DO NOT EDIT.
 
diff --git a/tstest/integration/tailscaled_deps_test_windows.go b/tstest/integration/tailscaled_deps_test_windows.go
index 8c1b8c35b..72ddab4ce 100644
--- a/tstest/integration/tailscaled_deps_test_windows.go
+++ b/tstest/integration/tailscaled_deps_test_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by gen_deps.go; DO NOT EDIT.
 
diff --git a/tstest/integration/testcontrol/testcontrol.go b/tstest/integration/testcontrol/testcontrol.go
index dacab3f69..2c724258c 100644
--- a/tstest/integration/testcontrol/testcontrol.go
+++ b/tstest/integration/testcontrol/testcontrol.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package testcontrol contains a minimal control plane server for testing purposes.
 package testcontrol
diff --git a/tstest/integration/vms/derive_bindhost_test.go b/tstest/integration/vms/derive_bindhost_test.go
index da793d5a0..85fe7e0cf 100644
--- a/tstest/integration/vms/derive_bindhost_test.go
+++ b/tstest/integration/vms/derive_bindhost_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package vms
 
diff --git a/tstest/integration/vms/distros.go b/tstest/integration/vms/distros.go
index ce63d6ebc..ea43e271b 100644
--- a/tstest/integration/vms/distros.go
+++ b/tstest/integration/vms/distros.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package vms
 
diff --git a/tstest/integration/vms/distros_test.go b/tstest/integration/vms/distros_test.go
index 00c98d9f4..462aa2a6b 100644
--- a/tstest/integration/vms/distros_test.go
+++ b/tstest/integration/vms/distros_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package vms
 
diff --git a/tstest/integration/vms/dns_tester.go b/tstest/integration/vms/dns_tester.go
index 014ec9044..50b39bb5f 100644
--- a/tstest/integration/vms/dns_tester.go
+++ b/tstest/integration/vms/dns_tester.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ignore
 
diff --git a/tstest/integration/vms/doc.go b/tstest/integration/vms/doc.go
index c69e6771a..6093b53ac 100644
--- a/tstest/integration/vms/doc.go
+++ b/tstest/integration/vms/doc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package vms does VM-based integration/functional tests by using
 // qemu and a bank of pre-made VM images.
diff --git a/tstest/integration/vms/gen/test_codegen.go b/tstest/integration/vms/gen/test_codegen.go
index 057cfccbf..a7bc596c9 100644
--- a/tstest/integration/vms/gen/test_codegen.go
+++ b/tstest/integration/vms/gen/test_codegen.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // build ignore
 
diff --git a/tstest/integration/vms/harness_test.go b/tstest/integration/vms/harness_test.go
index e5c45fdfd..a72de15ac 100644
--- a/tstest/integration/vms/harness_test.go
+++ b/tstest/integration/vms/harness_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/tstest/integration/vms/nixos_test.go b/tstest/integration/vms/nixos_test.go
index 8b12f321e..54402ca13 100644
--- a/tstest/integration/vms/nixos_test.go
+++ b/tstest/integration/vms/nixos_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/tstest/integration/vms/opensuse_leap_15_1_test.go b/tstest/integration/vms/opensuse_leap_15_1_test.go
index 71582cadf..be8690c45 100644
--- a/tstest/integration/vms/opensuse_leap_15_1_test.go
+++ b/tstest/integration/vms/opensuse_leap_15_1_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package vms
 
diff --git a/tstest/integration/vms/regex_flag.go b/tstest/integration/vms/regex_flag.go
index 5a78ca41e..02e399ecd 100644
--- a/tstest/integration/vms/regex_flag.go
+++ b/tstest/integration/vms/regex_flag.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package vms
 
diff --git a/tstest/integration/vms/regex_flag_test.go b/tstest/integration/vms/regex_flag_test.go
index d241ef78e..0f4e5f8f7 100644
--- a/tstest/integration/vms/regex_flag_test.go
+++ b/tstest/integration/vms/regex_flag_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package vms
 
diff --git a/tstest/integration/vms/top_level_test.go b/tstest/integration/vms/top_level_test.go
index fc38de39d..d282a2290 100644
--- a/tstest/integration/vms/top_level_test.go
+++ b/tstest/integration/vms/top_level_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/tstest/integration/vms/udp_tester.go b/tstest/integration/vms/udp_tester.go
index a1ade2a64..be44aa963 100644
--- a/tstest/integration/vms/udp_tester.go
+++ b/tstest/integration/vms/udp_tester.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ignore
 
diff --git a/tstest/integration/vms/vm_setup_test.go b/tstest/integration/vms/vm_setup_test.go
index 1666bc603..87320fb53 100644
--- a/tstest/integration/vms/vm_setup_test.go
+++ b/tstest/integration/vms/vm_setup_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/tstest/integration/vms/vms_steps_test.go b/tstest/integration/vms/vms_steps_test.go
index 9081eeb80..a776d72d1 100644
--- a/tstest/integration/vms/vms_steps_test.go
+++ b/tstest/integration/vms/vms_steps_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/tstest/integration/vms/vms_test.go b/tstest/integration/vms/vms_test.go
index 6b695fcb7..bf650b9db 100644
--- a/tstest/integration/vms/vms_test.go
+++ b/tstest/integration/vms/vms_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/tstest/iosdeps/iosdeps.go b/tstest/iosdeps/iosdeps.go
index b4593062d..f50fcde6e 100644
--- a/tstest/iosdeps/iosdeps.go
+++ b/tstest/iosdeps/iosdeps.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package iosdeps is a just a list of the packages we import on iOS, to let us
 // test that our transitive closure of dependencies on iOS doesn't accidentally
diff --git a/tstest/iosdeps/iosdeps_test.go b/tstest/iosdeps/iosdeps_test.go
index 6d16e6a15..f04f29eca 100644
--- a/tstest/iosdeps/iosdeps_test.go
+++ b/tstest/iosdeps/iosdeps_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // No need to run this on Windows where CI's slow enough. Then we don't need to
 // worry about "go.exe" etc.
diff --git a/tstest/jsdeps/jsdeps.go b/tstest/jsdeps/jsdeps.go
index 3b46ad60e..659a7459c 100644
--- a/tstest/jsdeps/jsdeps.go
+++ b/tstest/jsdeps/jsdeps.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package jsdeps is a just a list of the packages we import in the
 // JavaScript/WASM build, to let us test that our transitive closure of
diff --git a/tstest/jsdeps/jsdeps_test.go b/tstest/jsdeps/jsdeps_test.go
index 200a13c20..d18984c96 100644
--- a/tstest/jsdeps/jsdeps_test.go
+++ b/tstest/jsdeps/jsdeps_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // No need to run this on Windows where CI's slow enough. Then we don't need to
 // worry about "go.exe" etc.
diff --git a/tstest/log.go b/tstest/log.go
index 6f80da6be..683d446fb 100644
--- a/tstest/log.go
+++ b/tstest/log.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstest
 
diff --git a/tstest/log_test.go b/tstest/log_test.go
index 9ba3d4176..51a5743c2 100644
--- a/tstest/log_test.go
+++ b/tstest/log_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstest
 
diff --git a/tstest/natlab/firewall.go b/tstest/natlab/firewall.go
index c6d6c5a27..c427d6692 100644
--- a/tstest/natlab/firewall.go
+++ b/tstest/natlab/firewall.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package natlab
 
diff --git a/tstest/natlab/nat.go b/tstest/natlab/nat.go
index 88676d591..d756c5bf1 100644
--- a/tstest/natlab/nat.go
+++ b/tstest/natlab/nat.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package natlab
 
diff --git a/tstest/natlab/natlab.go b/tstest/natlab/natlab.go
index 5095cfcd6..9d625f7fe 100644
--- a/tstest/natlab/natlab.go
+++ b/tstest/natlab/natlab.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package natlab lets us simulate different types of networks all
 // in-memory without running VMs or requiring root, etc. Despite the
diff --git a/tstest/natlab/natlab_test.go b/tstest/natlab/natlab_test.go
index 8a1a9cdc0..4e9a48582 100644
--- a/tstest/natlab/natlab_test.go
+++ b/tstest/natlab/natlab_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package natlab
 
diff --git a/tstest/resource.go b/tstest/resource.go
index ae085ef5c..d1b515102 100644
--- a/tstest/resource.go
+++ b/tstest/resource.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstest
 
diff --git a/tstest/tools/tools.go b/tstest/tools/tools.go
index 6ffe23600..ca92c5de5 100644
--- a/tstest/tools/tools.go
+++ b/tstest/tools/tools.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This file exists just so `go mod tidy` won't remove
 // tool modules from our go.mod.
diff --git a/tstest/tstest.go b/tstest/tstest.go
index 0bda2d6cb..6cfcc6b36 100644
--- a/tstest/tstest.go
+++ b/tstest/tstest.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tstest provides utilities for use in unit tests.
 package tstest
diff --git a/tstime/jitter.go b/tstime/jitter.go
index 7407b141d..1d5e5c272 100644
--- a/tstime/jitter.go
+++ b/tstime/jitter.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstime
 
diff --git a/tstime/jitter_test.go b/tstime/jitter_test.go
index b82de2d5c..93b90ccc0 100644
--- a/tstime/jitter_test.go
+++ b/tstime/jitter_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstime
 
diff --git a/tstime/mono/mono.go b/tstime/mono/mono.go
index a04ce7cd0..6b02bb41a 100644
--- a/tstime/mono/mono.go
+++ b/tstime/mono/mono.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package mono provides fast monotonic time.
 // On most platforms, mono.Now is about 2x faster than time.Now.
diff --git a/tstime/mono/mono_test.go b/tstime/mono/mono_test.go
index 1cfc9eca2..a78f49791 100644
--- a/tstime/mono/mono_test.go
+++ b/tstime/mono/mono_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package mono
 
diff --git a/tstime/rate/rate.go b/tstime/rate/rate.go
index f06562838..a3f516077 100644
--- a/tstime/rate/rate.go
+++ b/tstime/rate/rate.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This is a modified, simplified version of code from golang.org/x/time/rate.
 
diff --git a/tstime/rate/rate_test.go b/tstime/rate/rate_test.go
index 90fd556be..d505cee1b 100644
--- a/tstime/rate/rate_test.go
+++ b/tstime/rate/rate_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // This is a modified, simplified version of code from golang.org/x/time/rate.
 
diff --git a/tstime/tstime.go b/tstime/tstime.go
index 3e7cf8cb1..9ad4ec76e 100644
--- a/tstime/tstime.go
+++ b/tstime/tstime.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tstime defines Tailscale-specific time utilities.
 package tstime
diff --git a/tstime/tstime_test.go b/tstime/tstime_test.go
index 637baf867..b44f9bc5a 100644
--- a/tstime/tstime_test.go
+++ b/tstime/tstime_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tstime
 
diff --git a/tsweb/debug.go b/tsweb/debug.go
index 7a308e995..cd9a63f2f 100644
--- a/tsweb/debug.go
+++ b/tsweb/debug.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsweb
 
diff --git a/tsweb/debug_test.go b/tsweb/debug_test.go
index f56a78812..2a68ab6fb 100644
--- a/tsweb/debug_test.go
+++ b/tsweb/debug_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsweb
 
diff --git a/tsweb/log.go b/tsweb/log.go
index 98c8336e3..059461ba7 100644
--- a/tsweb/log.go
+++ b/tsweb/log.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsweb
 
diff --git a/tsweb/tsweb.go b/tsweb/tsweb.go
index 8b52e656d..21ea23cb6 100644
--- a/tsweb/tsweb.go
+++ b/tsweb/tsweb.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tsweb contains code used in various Tailscale webservers.
 package tsweb
diff --git a/tsweb/tsweb_test.go b/tsweb/tsweb_test.go
index c1bcd34f7..132e35052 100644
--- a/tsweb/tsweb_test.go
+++ b/tsweb/tsweb_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tsweb
 
diff --git a/types/dnstype/dnstype.go b/types/dnstype/dnstype.go
index d3b8b26a6..a5137fa79 100644
--- a/types/dnstype/dnstype.go
+++ b/types/dnstype/dnstype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package dnstype defines types for working with DNS.
 package dnstype
diff --git a/types/dnstype/dnstype_clone.go b/types/dnstype/dnstype_clone.go
index f61bd1ba0..86ca0535f 100644
--- a/types/dnstype/dnstype_clone.go
+++ b/types/dnstype/dnstype_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/types/dnstype/dnstype_view.go b/types/dnstype/dnstype_view.go
index a15c5d526..b8f1e0312 100644
--- a/types/dnstype/dnstype_view.go
+++ b/types/dnstype/dnstype_view.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale/cmd/viewer; DO NOT EDIT.
 
diff --git a/types/empty/message.go b/types/empty/message.go
index 4e208ca49..dc8eb4cc2 100644
--- a/types/empty/message.go
+++ b/types/empty/message.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package empty defines an empty struct type.
 package empty
diff --git a/types/flagtype/flagtype.go b/types/flagtype/flagtype.go
index 6b97a2902..be160dee8 100644
--- a/types/flagtype/flagtype.go
+++ b/types/flagtype/flagtype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package flagtype defines flag.Value types.
 package flagtype
diff --git a/types/ipproto/ipproto.go b/types/ipproto/ipproto.go
index 5c9d101f6..66258f1ab 100644
--- a/types/ipproto/ipproto.go
+++ b/types/ipproto/ipproto.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package ipproto contains IP Protocol constants.
 package ipproto
diff --git a/types/key/chal.go b/types/key/chal.go
index b258210ff..8b46f4e52 100644
--- a/types/key/chal.go
+++ b/types/key/chal.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/control.go b/types/key/control.go
index 3784c6e1c..96021249b 100644
--- a/types/key/control.go
+++ b/types/key/control.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/control_test.go b/types/key/control_test.go
index 771072497..a98a586f3 100644
--- a/types/key/control_test.go
+++ b/types/key/control_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/disco.go b/types/key/disco.go
index 9580646cb..8f8ee5c88 100644
--- a/types/key/disco.go
+++ b/types/key/disco.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/disco_test.go b/types/key/disco_test.go
index 5c2f80818..c62c13cbf 100644
--- a/types/key/disco_test.go
+++ b/types/key/disco_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/machine.go b/types/key/machine.go
index b0caf3a49..2f78aebdf 100644
--- a/types/key/machine.go
+++ b/types/key/machine.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/machine_test.go b/types/key/machine_test.go
index ac6d74c8a..157df9e43 100644
--- a/types/key/machine_test.go
+++ b/types/key/machine_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/nl.go b/types/key/nl.go
index bf09944c2..1b70e2186 100644
--- a/types/key/nl.go
+++ b/types/key/nl.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/nl_test.go b/types/key/nl_test.go
index 631363383..75b7765a1 100644
--- a/types/key/nl_test.go
+++ b/types/key/nl_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/node.go b/types/key/node.go
index f47d5a95b..a84057231 100644
--- a/types/key/node.go
+++ b/types/key/node.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/node_test.go b/types/key/node_test.go
index b5b9a952b..26f580e97 100644
--- a/types/key/node_test.go
+++ b/types/key/node_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/util.go b/types/key/util.go
index ffb8da083..cf079be95 100644
--- a/types/key/util.go
+++ b/types/key/util.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/key/util_test.go b/types/key/util_test.go
index dff52b50c..accef8ddd 100644
--- a/types/key/util_test.go
+++ b/types/key/util_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package key
 
diff --git a/types/logger/logger.go b/types/logger/logger.go
index 0d2fcdd77..44c286d90 100644
--- a/types/logger/logger.go
+++ b/types/logger/logger.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package logger defines a type for writing to logs. It's just a
 // convenience type so that we don't have to pass verbose func(...)
diff --git a/types/logger/logger_test.go b/types/logger/logger_test.go
index 5d19ae038..e3f56dce6 100644
--- a/types/logger/logger_test.go
+++ b/types/logger/logger_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logger
 
diff --git a/types/logger/rusage.go b/types/logger/rusage.go
index daf2fdef4..3943636d6 100644
--- a/types/logger/rusage.go
+++ b/types/logger/rusage.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logger
 
diff --git a/types/logger/rusage_stub.go b/types/logger/rusage_stub.go
index 42114ba17..8f6ad5c9d 100644
--- a/types/logger/rusage_stub.go
+++ b/types/logger/rusage_stub.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows || js
 
diff --git a/types/logger/rusage_syscall.go b/types/logger/rusage_syscall.go
index e2901bb80..f02825f2f 100644
--- a/types/logger/rusage_syscall.go
+++ b/types/logger/rusage_syscall.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !js
 
diff --git a/types/logger/tokenbucket.go b/types/logger/tokenbucket.go
index 58c0ee2fd..83d4059c2 100644
--- a/types/logger/tokenbucket.go
+++ b/types/logger/tokenbucket.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logger
 
diff --git a/types/logid/id.go b/types/logid/id.go
index a55784052..c46289d4c 100644
--- a/types/logid/id.go
+++ b/types/logid/id.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logid
 
diff --git a/types/logid/id_test.go b/types/logid/id_test.go
index dbe16d95d..9390545ea 100644
--- a/types/logid/id_test.go
+++ b/types/logid/id_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package logid
 
diff --git a/types/netlogtype/netlogtype.go b/types/netlogtype/netlogtype.go
index d4b65d459..f2fa2bda9 100644
--- a/types/netlogtype/netlogtype.go
+++ b/types/netlogtype/netlogtype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netlogtype defines types for network logging.
 package netlogtype
diff --git a/types/netlogtype/netlogtype_test.go b/types/netlogtype/netlogtype_test.go
index cf8053c5a..7f29090c5 100644
--- a/types/netlogtype/netlogtype_test.go
+++ b/types/netlogtype/netlogtype_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netlogtype
 
diff --git a/types/netmap/netmap.go b/types/netmap/netmap.go
index 711c9c657..b1fdf94b3 100644
--- a/types/netmap/netmap.go
+++ b/types/netmap/netmap.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netmap contains the netmap.NetworkMap type.
 package netmap
diff --git a/types/netmap/netmap_test.go b/types/netmap/netmap_test.go
index 9bd54c980..84f52bb44 100644
--- a/types/netmap/netmap_test.go
+++ b/types/netmap/netmap_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netmap
 
diff --git a/types/nettype/nettype.go b/types/nettype/nettype.go
index a1506e115..c2d53b4c4 100644
--- a/types/nettype/nettype.go
+++ b/types/nettype/nettype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package nettype defines an interface that doesn't exist in the Go net package.
 package nettype
diff --git a/types/opt/bool.go b/types/opt/bool.go
index e438d7b19..66ff1bd82 100644
--- a/types/opt/bool.go
+++ b/types/opt/bool.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package opt defines optional types.
 package opt
diff --git a/types/opt/bool_test.go b/types/opt/bool_test.go
index d6ab30daf..2dc2d1707 100644
--- a/types/opt/bool_test.go
+++ b/types/opt/bool_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package opt
 
diff --git a/types/persist/persist.go b/types/persist/persist.go
index b21a5e26d..ce1f4c99e 100644
--- a/types/persist/persist.go
+++ b/types/persist/persist.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package persist contains the Persist type.
 package persist
diff --git a/types/persist/persist_clone.go b/types/persist/persist_clone.go
index 4cfc667e1..4bce7a03b 100644
--- a/types/persist/persist_clone.go
+++ b/types/persist/persist_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/types/persist/persist_test.go b/types/persist/persist_test.go
index f4be69304..2207c6d88 100644
--- a/types/persist/persist_test.go
+++ b/types/persist/persist_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package persist
 
diff --git a/types/persist/persist_view.go b/types/persist/persist_view.go
index ba7a111f7..81a61b472 100644
--- a/types/persist/persist_view.go
+++ b/types/persist/persist_view.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale/cmd/viewer; DO NOT EDIT.
 
diff --git a/types/preftype/netfiltermode.go b/types/preftype/netfiltermode.go
index cf9feb6b1..b85d54004 100644
--- a/types/preftype/netfiltermode.go
+++ b/types/preftype/netfiltermode.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package preftype is a leaf package containing types for various
 // preferences.
diff --git a/types/ptr/ptr.go b/types/ptr/ptr.go
index 8a454d1f6..beb17bee8 100644
--- a/types/ptr/ptr.go
+++ b/types/ptr/ptr.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package ptr contains the ptr.To function.
 package ptr
diff --git a/types/structs/structs.go b/types/structs/structs.go
index 237c02d6a..47c359f0c 100644
--- a/types/structs/structs.go
+++ b/types/structs/structs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package structs contains the Incomparable type.
 package structs
diff --git a/types/tkatype/tkatype.go b/types/tkatype/tkatype.go
index 8b60f3762..6ad51f6a9 100644
--- a/types/tkatype/tkatype.go
+++ b/types/tkatype/tkatype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tkatype defines types for working with the tka package.
 //
diff --git a/types/tkatype/tkatype_test.go b/types/tkatype/tkatype_test.go
index 04214901b..6def6bd9c 100644
--- a/types/tkatype/tkatype_test.go
+++ b/types/tkatype/tkatype_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tkatype
 
diff --git a/types/views/views.go b/types/views/views.go
index d0310a470..e155fc868 100644
--- a/types/views/views.go
+++ b/types/views/views.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package views provides read-only accessors for commonly used
 // value types.
diff --git a/types/views/views_test.go b/types/views/views_test.go
index 63902fd8b..129cabd17 100644
--- a/types/views/views_test.go
+++ b/types/views/views_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package views
 
diff --git a/util/cibuild/cibuild.go b/util/cibuild/cibuild.go
index 95b92244a..c1e337f9a 100644
--- a/util/cibuild/cibuild.go
+++ b/util/cibuild/cibuild.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package cibuild reports runtime CI information.
 package cibuild
diff --git a/util/clientmetric/clientmetric.go b/util/clientmetric/clientmetric.go
index 28ca78e67..e75b86858 100644
--- a/util/clientmetric/clientmetric.go
+++ b/util/clientmetric/clientmetric.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package clientmetric provides client-side metrics whose values
 // get occasionally logged.
diff --git a/util/clientmetric/clientmetric_test.go b/util/clientmetric/clientmetric_test.go
index a23512c9f..0bdb4e409 100644
--- a/util/clientmetric/clientmetric_test.go
+++ b/util/clientmetric/clientmetric_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package clientmetric
 
diff --git a/util/cloudenv/cloudenv.go b/util/cloudenv/cloudenv.go
index b6bf60979..3c86339e4 100644
--- a/util/cloudenv/cloudenv.go
+++ b/util/cloudenv/cloudenv.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package cloudenv reports which known cloud environment we're running in.
 package cloudenv
diff --git a/util/cmpver/version.go b/util/cmpver/version.go
index d58c5aac2..c7c99d50a 100644
--- a/util/cmpver/version.go
+++ b/util/cmpver/version.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package cmpver implements a variant of debian version number
 // comparison.
diff --git a/util/cmpver/version_test.go b/util/cmpver/version_test.go
index 26061eac1..3e34577f5 100644
--- a/util/cmpver/version_test.go
+++ b/util/cmpver/version_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cmpver
 
diff --git a/util/codegen/codegen.go b/util/codegen/codegen.go
index 31f4be724..f35450810 100644
--- a/util/codegen/codegen.go
+++ b/util/codegen/codegen.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package codegen contains shared utilities for generating code.
 package codegen
diff --git a/util/cstruct/cstruct.go b/util/cstruct/cstruct.go
index 98f11e498..464dc5dc3 100644
--- a/util/cstruct/cstruct.go
+++ b/util/cstruct/cstruct.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package cstruct provides a helper for decoding binary data that is in the
 // form of a padded C structure.
diff --git a/util/cstruct/cstruct_example_test.go b/util/cstruct/cstruct_example_test.go
index 1a2a97939..17032267b 100644
--- a/util/cstruct/cstruct_example_test.go
+++ b/util/cstruct/cstruct_example_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Only built on 64-bit platforms to avoid complexity
 
diff --git a/util/cstruct/cstruct_test.go b/util/cstruct/cstruct_test.go
index feb92f5cb..90e21841b 100644
--- a/util/cstruct/cstruct_test.go
+++ b/util/cstruct/cstruct_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cstruct
 
diff --git a/util/deephash/debug.go b/util/deephash/debug.go
index 72ac5ada3..50b3d5605 100644
--- a/util/deephash/debug.go
+++ b/util/deephash/debug.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build deephash_debug
 
diff --git a/util/deephash/deephash.go b/util/deephash/deephash.go
index 8df51b421..0795c2c07 100644
--- a/util/deephash/deephash.go
+++ b/util/deephash/deephash.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package deephash hashes a Go value recursively, in a predictable order,
 // without looping. The hash is only valid within the lifetime of a program.
diff --git a/util/deephash/deephash_test.go b/util/deephash/deephash_test.go
index 2802b4adf..df70bcd44 100644
--- a/util/deephash/deephash_test.go
+++ b/util/deephash/deephash_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package deephash
 
diff --git a/util/deephash/pointer.go b/util/deephash/pointer.go
index 6d651504d..aafae47a2 100644
--- a/util/deephash/pointer.go
+++ b/util/deephash/pointer.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package deephash
 
diff --git a/util/deephash/pointer_norace.go b/util/deephash/pointer_norace.go
index 19d7f543a..f98a70f6a 100644
--- a/util/deephash/pointer_norace.go
+++ b/util/deephash/pointer_norace.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !race
 
diff --git a/util/deephash/pointer_race.go b/util/deephash/pointer_race.go
index 477fad7be..c638c7d39 100644
--- a/util/deephash/pointer_race.go
+++ b/util/deephash/pointer_race.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build race
 
diff --git a/util/deephash/testtype/testtype.go b/util/deephash/testtype/testtype.go
index c95f819f4..3c90053d6 100644
--- a/util/deephash/testtype/testtype.go
+++ b/util/deephash/testtype/testtype.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package testtype contains types for testing deephash.
 package testtype
diff --git a/util/deephash/types.go b/util/deephash/types.go
index d6ccb5298..76fe43c76 100644
--- a/util/deephash/types.go
+++ b/util/deephash/types.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package deephash
 
diff --git a/util/deephash/types_test.go b/util/deephash/types_test.go
index 28ed3bddc..a16904f0e 100644
--- a/util/deephash/types_test.go
+++ b/util/deephash/types_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package deephash
 
diff --git a/util/dirwalk/dirwalk.go b/util/dirwalk/dirwalk.go
index 22e58fe1b..811766892 100644
--- a/util/dirwalk/dirwalk.go
+++ b/util/dirwalk/dirwalk.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package dirwalk contains code to walk a directory.
 package dirwalk
diff --git a/util/dirwalk/dirwalk_linux.go b/util/dirwalk/dirwalk_linux.go
index 7abcc9b34..256467ebd 100644
--- a/util/dirwalk/dirwalk_linux.go
+++ b/util/dirwalk/dirwalk_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dirwalk
 
diff --git a/util/dirwalk/dirwalk_test.go b/util/dirwalk/dirwalk_test.go
index ed6947ca9..2bec13ba2 100644
--- a/util/dirwalk/dirwalk_test.go
+++ b/util/dirwalk/dirwalk_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dirwalk
 
diff --git a/util/dnsname/dnsname.go b/util/dnsname/dnsname.go
index 759387fb7..ba5ed2a5a 100644
--- a/util/dnsname/dnsname.go
+++ b/util/dnsname/dnsname.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package dnsname contains string functions for working with DNS names.
 package dnsname
diff --git a/util/dnsname/dnsname_test.go b/util/dnsname/dnsname_test.go
index 05a511773..d8ec4b810 100644
--- a/util/dnsname/dnsname_test.go
+++ b/util/dnsname/dnsname_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dnsname
 
diff --git a/util/goroutines/goroutines.go b/util/goroutines/goroutines.go
index b3fc1389e..7ca7dc660 100644
--- a/util/goroutines/goroutines.go
+++ b/util/goroutines/goroutines.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // The goroutines package contains utilities for getting active goroutines.
 package goroutines
diff --git a/util/goroutines/goroutines_test.go b/util/goroutines/goroutines_test.go
index 4a5559e9c..24e5d36c9 100644
--- a/util/goroutines/goroutines_test.go
+++ b/util/goroutines/goroutines_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package goroutines
 
diff --git a/util/groupmember/groupmember.go b/util/groupmember/groupmember.go
index 3597bfa76..d0cace805 100644
--- a/util/groupmember/groupmember.go
+++ b/util/groupmember/groupmember.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package groupmember verifies group membership of the provided user on the
 // local system.
diff --git a/util/hashx/block512.go b/util/hashx/block512.go
index a4dc80c4a..e637c0c03 100644
--- a/util/hashx/block512.go
+++ b/util/hashx/block512.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package hashx provides a concrete implementation of [hash.Hash]
 // that operates on a particular block size.
diff --git a/util/hashx/block512_test.go b/util/hashx/block512_test.go
index b0222d9e2..5c0f0581c 100644
--- a/util/hashx/block512_test.go
+++ b/util/hashx/block512_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package hashx
 
diff --git a/util/httpm/httpm.go b/util/httpm/httpm.go
index 9e10076e3..a9a691b8a 100644
--- a/util/httpm/httpm.go
+++ b/util/httpm/httpm.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2023 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package httpm has shorter names for HTTP method constants.
 //
diff --git a/util/jsonutil/types.go b/util/jsonutil/types.go
index 0de04fdc7..057473249 100644
--- a/util/jsonutil/types.go
+++ b/util/jsonutil/types.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package jsonutil
 
diff --git a/util/jsonutil/unmarshal.go b/util/jsonutil/unmarshal.go
index a403be542..b1eb4ea87 100644
--- a/util/jsonutil/unmarshal.go
+++ b/util/jsonutil/unmarshal.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package jsonutil provides utilities to improve JSON performance.
 // It includes an Unmarshal wrapper that amortizes allocated garbage over subsequent runs
diff --git a/util/jsonutil/unmarshal_test.go b/util/jsonutil/unmarshal_test.go
index 04712422c..b9d87c218 100644
--- a/util/jsonutil/unmarshal_test.go
+++ b/util/jsonutil/unmarshal_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package jsonutil
 
diff --git a/util/lineread/lineread.go b/util/lineread/lineread.go
index 3ac063094..6b01d2b69 100644
--- a/util/lineread/lineread.go
+++ b/util/lineread/lineread.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package lineread reads lines from files. It's not fancy, but it got repetitive.
 package lineread
diff --git a/util/mak/mak.go b/util/mak/mak.go
index a041c82ed..e2c9feaa3 100644
--- a/util/mak/mak.go
+++ b/util/mak/mak.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package mak helps make maps. It contains generic helpers to make/assign
 // things, notably to maps, but also slices.
diff --git a/util/mak/mak_test.go b/util/mak/mak_test.go
index 5848ff5d1..4de499a9d 100644
--- a/util/mak/mak_test.go
+++ b/util/mak/mak_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package mak contains code to help make things.
 package mak
diff --git a/util/multierr/multierr.go b/util/multierr/multierr.go
index b4ae0afe5..5660e17c3 100644
--- a/util/multierr/multierr.go
+++ b/util/multierr/multierr.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package multierr provides a simple multiple-error type.
 // It was inspired by github.com/go-multierror/multierror.
diff --git a/util/multierr/multierr_test.go b/util/multierr/multierr_test.go
index 28b4efdb9..031b449a1 100644
--- a/util/multierr/multierr_test.go
+++ b/util/multierr/multierr_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package multierr_test
 
diff --git a/util/must/must.go b/util/must/must.go
index 55abf0db0..21965daa9 100644
--- a/util/must/must.go
+++ b/util/must/must.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package must assists in calling functions that must succeed.
 //
diff --git a/util/osshare/filesharingstatus_noop.go b/util/osshare/filesharingstatus_noop.go
index 953c470b6..7f2b13190 100644
--- a/util/osshare/filesharingstatus_noop.go
+++ b/util/osshare/filesharingstatus_noop.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/util/osshare/filesharingstatus_windows.go b/util/osshare/filesharingstatus_windows.go
index f0cea5b57..4fa3afab5 100644
--- a/util/osshare/filesharingstatus_windows.go
+++ b/util/osshare/filesharingstatus_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows
 
diff --git a/util/pidowner/pidowner.go b/util/pidowner/pidowner.go
index f8e46adf4..56bb640b7 100644
--- a/util/pidowner/pidowner.go
+++ b/util/pidowner/pidowner.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package pidowner handles lookups from process ID to its owning user.
 package pidowner
diff --git a/util/pidowner/pidowner_linux.go b/util/pidowner/pidowner_linux.go
index d2043ff1f..2a5181f14 100644
--- a/util/pidowner/pidowner_linux.go
+++ b/util/pidowner/pidowner_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package pidowner
 
diff --git a/util/pidowner/pidowner_noimpl.go b/util/pidowner/pidowner_noimpl.go
index 054666ef9..50add492f 100644
--- a/util/pidowner/pidowner_noimpl.go
+++ b/util/pidowner/pidowner_noimpl.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !linux
 
diff --git a/util/pidowner/pidowner_test.go b/util/pidowner/pidowner_test.go
index ac81293d5..960a0e930 100644
--- a/util/pidowner/pidowner_test.go
+++ b/util/pidowner/pidowner_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package pidowner
 
diff --git a/util/pidowner/pidowner_windows.go b/util/pidowner/pidowner_windows.go
index bac7061ec..dbf13ac81 100644
--- a/util/pidowner/pidowner_windows.go
+++ b/util/pidowner/pidowner_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package pidowner
 
diff --git a/util/precompress/precompress.go b/util/precompress/precompress.go
index 32181dffa..6d1a26efd 100644
--- a/util/precompress/precompress.go
+++ b/util/precompress/precompress.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package precompress provides build- and serving-time support for
 // precompressed static resources, to avoid the cost of repeatedly compressing
diff --git a/util/quarantine/quarantine.go b/util/quarantine/quarantine.go
index e8f404dfb..7ad65a81d 100644
--- a/util/quarantine/quarantine.go
+++ b/util/quarantine/quarantine.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package quarantine sets platform specific "quarantine" attributes on files
 // that are received from other hosts.
diff --git a/util/quarantine/quarantine_darwin.go b/util/quarantine/quarantine_darwin.go
index 69ccc0b30..35405d9cc 100644
--- a/util/quarantine/quarantine_darwin.go
+++ b/util/quarantine/quarantine_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package quarantine
 
diff --git a/util/quarantine/quarantine_default.go b/util/quarantine/quarantine_default.go
index 86c56845d..65954a4d2 100644
--- a/util/quarantine/quarantine_default.go
+++ b/util/quarantine/quarantine_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !darwin && !windows
 
diff --git a/util/quarantine/quarantine_windows.go b/util/quarantine/quarantine_windows.go
index ebf4498ec..6fdf4e699 100644
--- a/util/quarantine/quarantine_windows.go
+++ b/util/quarantine/quarantine_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package quarantine
 
diff --git a/util/racebuild/off.go b/util/racebuild/off.go
index 46a01c39b..8f4fe998f 100644
--- a/util/racebuild/off.go
+++ b/util/racebuild/off.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !race
 
diff --git a/util/racebuild/on.go b/util/racebuild/on.go
index 768a4039b..69ae2bcae 100644
--- a/util/racebuild/on.go
+++ b/util/racebuild/on.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build race
 
diff --git a/util/racebuild/racebuild.go b/util/racebuild/racebuild.go
index 30aad83e9..d061276cb 100644
--- a/util/racebuild/racebuild.go
+++ b/util/racebuild/racebuild.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package racebuild exports a constant about whether the current binary
 // was built with the race detector.
diff --git a/util/set/set.go b/util/set/set.go
index cf2a81953..e631904a9 100644
--- a/util/set/set.go
+++ b/util/set/set.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package set contains set types.
 package set
diff --git a/util/singleflight/singleflight.go b/util/singleflight/singleflight.go
index b823b0b15..a1c9e4766 100644
--- a/util/singleflight/singleflight.go
+++ b/util/singleflight/singleflight.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
diff --git a/util/singleflight/singleflight_test.go b/util/singleflight/singleflight_test.go
index 0cfb7b9ee..26a08ed60 100644
--- a/util/singleflight/singleflight_test.go
+++ b/util/singleflight/singleflight_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
diff --git a/util/strs/strs.go b/util/strs/strs.go
index 40d4b12bf..6ecdc7403 100644
--- a/util/strs/strs.go
+++ b/util/strs/strs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package strs contains string-related utility funcs.
 package strs
diff --git a/util/strs/strs_test.go b/util/strs/strs_test.go
index 3ac416d2c..893eac035 100644
--- a/util/strs/strs_test.go
+++ b/util/strs/strs_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package strs
 
diff --git a/util/systemd/doc.go b/util/systemd/doc.go
index 9830685bd..0c28e1823 100644
--- a/util/systemd/doc.go
+++ b/util/systemd/doc.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 /*
 Package systemd contains a minimal wrapper around systemd-notify to enable
diff --git a/util/systemd/systemd_linux.go b/util/systemd/systemd_linux.go
index aefed2087..909cfcb20 100644
--- a/util/systemd/systemd_linux.go
+++ b/util/systemd/systemd_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/util/systemd/systemd_nonlinux.go b/util/systemd/systemd_nonlinux.go
index 0aa221786..36214020c 100644
--- a/util/systemd/systemd_nonlinux.go
+++ b/util/systemd/systemd_nonlinux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux
 
diff --git a/util/uniq/slice.go b/util/uniq/slice.go
index 49c240ca9..4ab933a9d 100644
--- a/util/uniq/slice.go
+++ b/util/uniq/slice.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package uniq provides removal of adjacent duplicate elements in slices.
 // It is similar to the unix command uniq.
diff --git a/util/uniq/slice_test.go b/util/uniq/slice_test.go
index d4f8018d7..eed0d5fd5 100644
--- a/util/uniq/slice_test.go
+++ b/util/uniq/slice_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package uniq_test
 
diff --git a/util/winutil/mksyscall.go b/util/winutil/mksyscall.go
index 28063dfd0..e727431ac 100644
--- a/util/winutil/mksyscall.go
+++ b/util/winutil/mksyscall.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package winutil
 
diff --git a/util/winutil/svcdiag_windows.go b/util/winutil/svcdiag_windows.go
index 48ce180d2..ce8706a06 100644
--- a/util/winutil/svcdiag_windows.go
+++ b/util/winutil/svcdiag_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package winutil
 
diff --git a/util/winutil/winutil.go b/util/winutil/winutil.go
index 324ed074d..9ccc9e085 100644
--- a/util/winutil/winutil.go
+++ b/util/winutil/winutil.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package winutil contains misc Windows/Win32 helper functions.
 package winutil
diff --git a/util/winutil/winutil_notwindows.go b/util/winutil/winutil_notwindows.go
index 9d573568c..0f2c4a83a 100644
--- a/util/winutil/winutil_notwindows.go
+++ b/util/winutil/winutil_notwindows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows
 
diff --git a/util/winutil/winutil_windows.go b/util/winutil/winutil_windows.go
index 0a35b5f35..89fc543db 100644
--- a/util/winutil/winutil_windows.go
+++ b/util/winutil/winutil_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package winutil
 
diff --git a/util/winutil/winutil_windows_test.go b/util/winutil/winutil_windows_test.go
index 0620d1c8e..bf22d26ca 100644
--- a/util/winutil/winutil_windows_test.go
+++ b/util/winutil/winutil_windows_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package winutil
 
diff --git a/version-embed.go b/version-embed.go
index 0fc1f9a00..da2bb10ff 100644
--- a/version-embed.go
+++ b/version-embed.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package tailscaleroot embeds VERSION.txt into the binary.
 package tailscaleroot
diff --git a/version/cmdname.go b/version/cmdname.go
index e6aebc8ca..f60f72cfc 100644
--- a/version/cmdname.go
+++ b/version/cmdname.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios
 
diff --git a/version/cmdname_ios.go b/version/cmdname_ios.go
index 26e8d8b2e..6bfed38b6 100644
--- a/version/cmdname_ios.go
+++ b/version/cmdname_ios.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ios
 
diff --git a/version/cmp.go b/version/cmp.go
index 3b188897b..857d43b1e 100644
--- a/version/cmp.go
+++ b/version/cmp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version
 
diff --git a/version/cmp_test.go b/version/cmp_test.go
index b832be3c8..e244d5e16 100644
--- a/version/cmp_test.go
+++ b/version/cmp_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version_test
 
diff --git a/version/distro/distro.go b/version/distro/distro.go
index 64f49f2ef..e666b6bdf 100644
--- a/version/distro/distro.go
+++ b/version/distro/distro.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package distro reports which distro we're running on.
 package distro
diff --git a/version/distro/distro_test.go b/version/distro/distro_test.go
index bc4e8c5b4..63edb9299 100644
--- a/version/distro/distro_test.go
+++ b/version/distro/distro_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package distro
 
diff --git a/version/export_test.go b/version/export_test.go
index 66dddc346..8e8ce5ecb 100644
--- a/version/export_test.go
+++ b/version/export_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version
 
diff --git a/version/modinfo_test.go b/version/modinfo_test.go
index 3a8725abd..bf5ea61d5 100644
--- a/version/modinfo_test.go
+++ b/version/modinfo_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version_test
 
diff --git a/version/print.go b/version/print.go
index cf0da7613..f17fe4927 100644
--- a/version/print.go
+++ b/version/print.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version
 
diff --git a/version/prop.go b/version/prop.go
index fe2b1fe29..710c6aabe 100644
--- a/version/prop.go
+++ b/version/prop.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version
 
diff --git a/version/race.go b/version/race.go
index d5b3a24c4..e1dc76591 100644
--- a/version/race.go
+++ b/version/race.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build race
 
diff --git a/version/race_off.go b/version/race_off.go
index b34c5baf9..6db901974 100644
--- a/version/race_off.go
+++ b/version/race_off.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !race
 
diff --git a/version/version.go b/version/version.go
index 0557eccfd..2028488de 100644
--- a/version/version.go
+++ b/version/version.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package version provides the version that the binary was built at.
 package version
diff --git a/version/version_test.go b/version/version_test.go
index ca33d8a83..a363e1985 100644
--- a/version/version_test.go
+++ b/version/version_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package version_test
 
diff --git a/version_test.go b/version_test.go
index 9b99609f3..33c22dd79 100644
--- a/version_test.go
+++ b/version_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tailscaleroot
 
diff --git a/wf/firewall.go b/wf/firewall.go
index abe76a987..ac99582fa 100644
--- a/wf/firewall.go
+++ b/wf/firewall.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows
 
diff --git a/wgengine/bench/bench.go b/wgengine/bench/bench.go
index 7a204ced6..8695f18d1 100644
--- a/wgengine/bench/bench.go
+++ b/wgengine/bench/bench.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Create two wgengine instances and pass data through them, measuring
 // throughput, latency, and packet loss.
diff --git a/wgengine/bench/bench_test.go b/wgengine/bench/bench_test.go
index f9a3a0310..4fae86c05 100644
--- a/wgengine/bench/bench_test.go
+++ b/wgengine/bench/bench_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Create two wgengine instances and pass data through them, measuring
 // throughput, latency, and packet loss.
diff --git a/wgengine/bench/trafficgen.go b/wgengine/bench/trafficgen.go
index 4038ff1da..ce79c616f 100644
--- a/wgengine/bench/trafficgen.go
+++ b/wgengine/bench/trafficgen.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/wgengine/bench/wg.go b/wgengine/bench/wg.go
index eb76a479a..c7b01af28 100644
--- a/wgengine/bench/wg.go
+++ b/wgengine/bench/wg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package main
 
diff --git a/wgengine/filter/filter.go b/wgengine/filter/filter.go
index f573a2d07..350f319e1 100644
--- a/wgengine/filter/filter.go
+++ b/wgengine/filter/filter.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package filter is a stateful packet filter.
 package filter
diff --git a/wgengine/filter/filter_clone.go b/wgengine/filter/filter_clone.go
index 03fcaa50d..794550f57 100644
--- a/wgengine/filter/filter_clone.go
+++ b/wgengine/filter/filter_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/wgengine/filter/filter_test.go b/wgengine/filter/filter_test.go
index e583061e6..d7f408135 100644
--- a/wgengine/filter/filter_test.go
+++ b/wgengine/filter/filter_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filter
 
diff --git a/wgengine/filter/match.go b/wgengine/filter/match.go
index 10484ce41..7c73b9630 100644
--- a/wgengine/filter/match.go
+++ b/wgengine/filter/match.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filter
 
diff --git a/wgengine/filter/tailcfg.go b/wgengine/filter/tailcfg.go
index 158c85743..de3cde97f 100644
--- a/wgengine/filter/tailcfg.go
+++ b/wgengine/filter/tailcfg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package filter
 
diff --git a/wgengine/magicsock/debughttp.go b/wgengine/magicsock/debughttp.go
index efdf01d96..f3b61bca4 100644
--- a/wgengine/magicsock/debughttp.go
+++ b/wgengine/magicsock/debughttp.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package magicsock
 
diff --git a/wgengine/magicsock/debugknobs.go b/wgengine/magicsock/debugknobs.go
index 54c554898..a53856e65 100644
--- a/wgengine/magicsock/debugknobs.go
+++ b/wgengine/magicsock/debugknobs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !js
 
diff --git a/wgengine/magicsock/debugknobs_stubs.go b/wgengine/magicsock/debugknobs_stubs.go
index 9c2214698..06fedd87c 100644
--- a/wgengine/magicsock/debugknobs_stubs.go
+++ b/wgengine/magicsock/debugknobs_stubs.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build ios || js
 
diff --git a/wgengine/magicsock/discopingpurpose_string.go b/wgengine/magicsock/discopingpurpose_string.go
index b835704e9..6329172dc 100644
--- a/wgengine/magicsock/discopingpurpose_string.go
+++ b/wgengine/magicsock/discopingpurpose_string.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by "stringer -type=discoPingPurpose -trimprefix=ping"; DO NOT EDIT.
 
diff --git a/wgengine/magicsock/magicsock.go b/wgengine/magicsock/magicsock.go
index 9723eedf0..5fb428f71 100644
--- a/wgengine/magicsock/magicsock.go
+++ b/wgengine/magicsock/magicsock.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2019 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package magicsock implements a socket that can change its communication path while
 // in use, actively searching for the best way to communicate.
diff --git a/wgengine/magicsock/magicsock_default.go b/wgengine/magicsock/magicsock_default.go
index 5668f8aaa..8cdfd09e1 100644
--- a/wgengine/magicsock/magicsock_default.go
+++ b/wgengine/magicsock/magicsock_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !linux
 
diff --git a/wgengine/magicsock/magicsock_linux.go b/wgengine/magicsock/magicsock_linux.go
index 23af6c063..024fac8a5 100644
--- a/wgengine/magicsock/magicsock_linux.go
+++ b/wgengine/magicsock/magicsock_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package magicsock
 
diff --git a/wgengine/magicsock/magicsock_test.go b/wgengine/magicsock/magicsock_test.go
index c9b4a6c06..53e8b60d9 100644
--- a/wgengine/magicsock/magicsock_test.go
+++ b/wgengine/magicsock/magicsock_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package magicsock
 
diff --git a/wgengine/magicsock/magicsock_unix_test.go b/wgengine/magicsock/magicsock_unix_test.go
index 9df9a3735..b0700a8eb 100644
--- a/wgengine/magicsock/magicsock_unix_test.go
+++ b/wgengine/magicsock/magicsock_unix_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build unix
 
diff --git a/wgengine/magicsock/pathfinder.go b/wgengine/magicsock/pathfinder.go
index b6b408853..830709d24 100644
--- a/wgengine/magicsock/pathfinder.go
+++ b/wgengine/magicsock/pathfinder.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package magicsock
 
diff --git a/wgengine/mem_ios.go b/wgengine/mem_ios.go
index ba370104b..cc266ea3a 100644
--- a/wgengine/mem_ios.go
+++ b/wgengine/mem_ios.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine
 
diff --git a/wgengine/monitor/monitor.go b/wgengine/monitor/monitor.go
index 84d6db5e6..52bb0bc1c 100644
--- a/wgengine/monitor/monitor.go
+++ b/wgengine/monitor/monitor.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package monitor provides facilities for monitoring network
 // interface and route changes. It primarily exists to know when
diff --git a/wgengine/monitor/monitor_darwin.go b/wgengine/monitor/monitor_darwin.go
index 33e1f001e..da720f5d6 100644
--- a/wgengine/monitor/monitor_darwin.go
+++ b/wgengine/monitor/monitor_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package monitor
 
diff --git a/wgengine/monitor/monitor_darwin_test.go b/wgengine/monitor/monitor_darwin_test.go
index 48456b93e..375cd87a7 100644
--- a/wgengine/monitor/monitor_darwin_test.go
+++ b/wgengine/monitor/monitor_darwin_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package monitor
 
diff --git a/wgengine/monitor/monitor_freebsd.go b/wgengine/monitor/monitor_freebsd.go
index f2f85fa85..5acd8e098 100644
--- a/wgengine/monitor/monitor_freebsd.go
+++ b/wgengine/monitor/monitor_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package monitor
 
diff --git a/wgengine/monitor/monitor_linux.go b/wgengine/monitor/monitor_linux.go
index 376c90315..4acb79887 100644
--- a/wgengine/monitor/monitor_linux.go
+++ b/wgengine/monitor/monitor_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !android
 
diff --git a/wgengine/monitor/monitor_linux_test.go b/wgengine/monitor/monitor_linux_test.go
index 631b380f9..56beb0019 100644
--- a/wgengine/monitor/monitor_linux_test.go
+++ b/wgengine/monitor/monitor_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package monitor
 
diff --git a/wgengine/monitor/monitor_polling.go b/wgengine/monitor/monitor_polling.go
index b625878d9..0f807d053 100644
--- a/wgengine/monitor/monitor_polling.go
+++ b/wgengine/monitor/monitor_polling.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build (!linux && !freebsd && !windows && !darwin) || android
 
diff --git a/wgengine/monitor/monitor_test.go b/wgengine/monitor/monitor_test.go
index 9dd012ded..f93153a95 100644
--- a/wgengine/monitor/monitor_test.go
+++ b/wgengine/monitor/monitor_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package monitor
 
diff --git a/wgengine/monitor/monitor_windows.go b/wgengine/monitor/monitor_windows.go
index bd39f3b72..6242d7418 100644
--- a/wgengine/monitor/monitor_windows.go
+++ b/wgengine/monitor/monitor_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package monitor
 
diff --git a/wgengine/monitor/polling.go b/wgengine/monitor/polling.go
index 42794bdd7..b1028de73 100644
--- a/wgengine/monitor/polling.go
+++ b/wgengine/monitor/polling.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !darwin
 
diff --git a/wgengine/netlog/logger.go b/wgengine/netlog/logger.go
index 19970d626..cd7937a9d 100644
--- a/wgengine/netlog/logger.go
+++ b/wgengine/netlog/logger.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netlog provides a logger that monitors a TUN device and
 // periodically records any traffic into a log stream.
diff --git a/wgengine/netstack/netstack.go b/wgengine/netstack/netstack.go
index 992e99b00..c7878b14e 100644
--- a/wgengine/netstack/netstack.go
+++ b/wgengine/netstack/netstack.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package netstack wires up gVisor's netstack into Tailscale.
 package netstack
diff --git a/wgengine/netstack/netstack_linux.go b/wgengine/netstack/netstack_linux.go
index a90d62450..a0bfb4456 100644
--- a/wgengine/netstack/netstack_linux.go
+++ b/wgengine/netstack/netstack_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netstack
 
diff --git a/wgengine/netstack/netstack_test.go b/wgengine/netstack/netstack_test.go
index 9c21048b0..b229396ba 100644
--- a/wgengine/netstack/netstack_test.go
+++ b/wgengine/netstack/netstack_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netstack
 
diff --git a/wgengine/netstack/subnet_router_wrapper.go b/wgengine/netstack/subnet_router_wrapper.go
index e216fb4ee..dd9c96ec6 100644
--- a/wgengine/netstack/subnet_router_wrapper.go
+++ b/wgengine/netstack/subnet_router_wrapper.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package netstack
 
diff --git a/wgengine/pendopen.go b/wgengine/pendopen.go
index 5e9864e37..f21ef75ec 100644
--- a/wgengine/pendopen.go
+++ b/wgengine/pendopen.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine
 
diff --git a/wgengine/router/callback.go b/wgengine/router/callback.go
index dd5676c80..1d7f32846 100644
--- a/wgengine/router/callback.go
+++ b/wgengine/router/callback.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/ifconfig_windows_test.go b/wgengine/router/ifconfig_windows_test.go
index 1605829af..4679a149d 100644
--- a/wgengine/router/ifconfig_windows_test.go
+++ b/wgengine/router/ifconfig_windows_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router.go b/wgengine/router/router.go
index 48b54a3fa..f6e55b7d9 100644
--- a/wgengine/router/router.go
+++ b/wgengine/router/router.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package router presents an interface to manipulate the host network
 // stack's state.
diff --git a/wgengine/router/router_darwin.go b/wgengine/router/router_darwin.go
index 02992def8..96076e6e6 100644
--- a/wgengine/router/router_darwin.go
+++ b/wgengine/router/router_darwin.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_default.go b/wgengine/router/router_default.go
index 0e717e551..4fcf65ad8 100644
--- a/wgengine/router/router_default.go
+++ b/wgengine/router/router_default.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !windows && !linux && !darwin && !openbsd && !freebsd
 
diff --git a/wgengine/router/router_fake.go b/wgengine/router/router_fake.go
index add4b576b..db35fc9ee 100644
--- a/wgengine/router/router_fake.go
+++ b/wgengine/router/router_fake.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_freebsd.go b/wgengine/router/router_freebsd.go
index 8a87603ef..13e886969 100644
--- a/wgengine/router/router_freebsd.go
+++ b/wgengine/router/router_freebsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_linux.go b/wgengine/router/router_linux.go
index e65129c47..4afdaf7fb 100644
--- a/wgengine/router/router_linux.go
+++ b/wgengine/router/router_linux.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_linux_test.go b/wgengine/router/router_linux_test.go
index 0b6d0836e..1883e6b4b 100644
--- a/wgengine/router/router_linux_test.go
+++ b/wgengine/router/router_linux_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_openbsd.go b/wgengine/router/router_openbsd.go
index 2f3ec379a..6bbd0e06c 100644
--- a/wgengine/router/router_openbsd.go
+++ b/wgengine/router/router_openbsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_test.go b/wgengine/router/router_test.go
index 00c4d2f73..413de5742 100644
--- a/wgengine/router/router_test.go
+++ b/wgengine/router/router_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/router_userspace_bsd.go b/wgengine/router/router_userspace_bsd.go
index f13d0d682..b1f2d6367 100644
--- a/wgengine/router/router_userspace_bsd.go
+++ b/wgengine/router/router_userspace_bsd.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build darwin || freebsd
 
diff --git a/wgengine/router/router_windows.go b/wgengine/router/router_windows.go
index 8c84d52d5..8657bf26b 100644
--- a/wgengine/router/router_windows.go
+++ b/wgengine/router/router_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package router
 
diff --git a/wgengine/router/runner.go b/wgengine/router/runner.go
index a22c11654..8fa068e33 100644
--- a/wgengine/router/runner.go
+++ b/wgengine/router/runner.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build linux
 
diff --git a/wgengine/userspace.go b/wgengine/userspace.go
index 51e6d7c43..ff0791f10 100644
--- a/wgengine/userspace.go
+++ b/wgengine/userspace.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine
 
diff --git a/wgengine/userspace_ext_test.go b/wgengine/userspace_ext_test.go
index 94d97e1f6..b2235c9c9 100644
--- a/wgengine/userspace_ext_test.go
+++ b/wgengine/userspace_ext_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine_test
 
diff --git a/wgengine/userspace_test.go b/wgengine/userspace_test.go
index 8a3ed1d93..de0555c5a 100644
--- a/wgengine/userspace_test.go
+++ b/wgengine/userspace_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine
 
diff --git a/wgengine/watchdog.go b/wgengine/watchdog.go
index 8fd2d4484..5aeca218e 100644
--- a/wgengine/watchdog.go
+++ b/wgengine/watchdog.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !js
 
diff --git a/wgengine/watchdog_js.go b/wgengine/watchdog_js.go
index 1270c2e25..872ce36d5 100644
--- a/wgengine/watchdog_js.go
+++ b/wgengine/watchdog_js.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build js
 
diff --git a/wgengine/watchdog_test.go b/wgengine/watchdog_test.go
index 1d912abe6..da453606a 100644
--- a/wgengine/watchdog_test.go
+++ b/wgengine/watchdog_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine
 
diff --git a/wgengine/wgcfg/config.go b/wgengine/wgcfg/config.go
index 96eeda1bd..3281c166a 100644
--- a/wgengine/wgcfg/config.go
+++ b/wgengine/wgcfg/config.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package wgcfg has types and a parser for representing WireGuard config.
 package wgcfg
diff --git a/wgengine/wgcfg/device.go b/wgengine/wgcfg/device.go
index 31cc06ce3..80fa159e3 100644
--- a/wgengine/wgcfg/device.go
+++ b/wgengine/wgcfg/device.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgcfg
 
diff --git a/wgengine/wgcfg/device_test.go b/wgengine/wgcfg/device_test.go
index bc05f9fef..d54282e4b 100644
--- a/wgengine/wgcfg/device_test.go
+++ b/wgengine/wgcfg/device_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgcfg
 
diff --git a/wgengine/wgcfg/nmcfg/nmcfg.go b/wgengine/wgcfg/nmcfg/nmcfg.go
index 604e8b309..be5a4be44 100644
--- a/wgengine/wgcfg/nmcfg/nmcfg.go
+++ b/wgengine/wgcfg/nmcfg/nmcfg.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package nmcfg converts a controlclient.NetMap into a wgcfg config.
 package nmcfg
diff --git a/wgengine/wgcfg/parser.go b/wgengine/wgcfg/parser.go
index 21d8ad41d..ec3d008f7 100644
--- a/wgengine/wgcfg/parser.go
+++ b/wgengine/wgcfg/parser.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgcfg
 
diff --git a/wgengine/wgcfg/parser_test.go b/wgengine/wgcfg/parser_test.go
index 54e0c34d5..eb3345c10 100644
--- a/wgengine/wgcfg/parser_test.go
+++ b/wgengine/wgcfg/parser_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgcfg
 
diff --git a/wgengine/wgcfg/wgcfg_clone.go b/wgengine/wgcfg/wgcfg_clone.go
index 853bff4bc..35fb018cb 100644
--- a/wgengine/wgcfg/wgcfg_clone.go
+++ b/wgengine/wgcfg/wgcfg_clone.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
 
diff --git a/wgengine/wgcfg/writer.go b/wgengine/wgcfg/writer.go
index 8e5024f3c..88864ee0e 100644
--- a/wgengine/wgcfg/writer.go
+++ b/wgengine/wgcfg/writer.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgcfg
 
diff --git a/wgengine/wgengine.go b/wgengine/wgengine.go
index 1bee017d2..50d3193cb 100644
--- a/wgengine/wgengine.go
+++ b/wgengine/wgengine.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgengine
 
diff --git a/wgengine/wgint/wgint.go b/wgengine/wgint/wgint.go
index 4927fa899..dc9fe08d2 100644
--- a/wgengine/wgint/wgint.go
+++ b/wgengine/wgint/wgint.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package wgint provides somewhat shady access to wireguard-go
 // internals that don't (yet) have public APIs.
diff --git a/wgengine/wgint/wgint_test.go b/wgengine/wgint/wgint_test.go
index 8852e9509..9eae29c7f 100644
--- a/wgengine/wgint/wgint_test.go
+++ b/wgengine/wgint/wgint_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wgint
 
diff --git a/wgengine/wglog/wglog.go b/wgengine/wglog/wglog.go
index 152d92820..b46651c80 100644
--- a/wgengine/wglog/wglog.go
+++ b/wgengine/wglog/wglog.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package wglog contains logging helpers for wireguard-go.
 package wglog
diff --git a/wgengine/wglog/wglog_test.go b/wgengine/wglog/wglog_test.go
index 02c8dafbe..b3282e76a 100644
--- a/wgengine/wglog/wglog_test.go
+++ b/wgengine/wglog/wglog_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package wglog_test
 
diff --git a/wgengine/winnet/winnet.go b/wgengine/winnet/winnet.go
index bbe5bf563..dddd56844 100644
--- a/wgengine/winnet/winnet.go
+++ b/wgengine/winnet/winnet.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 //go:build windows
 
diff --git a/wgengine/winnet/winnet_windows.go b/wgengine/winnet/winnet_windows.go
index 7717a40fe..283ce5ad1 100644
--- a/wgengine/winnet/winnet_windows.go
+++ b/wgengine/winnet/winnet_windows.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package winnet
 
diff --git a/words/words.go b/words/words.go
index 2d0c94925..b373ffef6 100644
--- a/words/words.go
+++ b/words/words.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package words contains accessors for some nice words.
 package words
diff --git a/words/words_test.go b/words/words_test.go
index e2e77e59b..a9691792a 100644
--- a/words/words_test.go
+++ b/words/words_test.go
@@ -1,6 +1,5 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
 
 package words