diff --git a/metropolis/cli/dbg/main.go b/metropolis/cli/dbg/main.go
index e9e43be..1845ad1 100644
--- a/metropolis/cli/dbg/main.go
+++ b/metropolis/cli/dbg/main.go
@@ -1,18 +1,5 @@
-// Copyright 2020 The Monogon Project Authors.
-//
+// Copyright The Monogon Project Authors.
 // SPDX-License-Identifier: Apache-2.0
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
 
 package main
 
diff --git a/metropolis/cli/flagdefs/flagdefs.go b/metropolis/cli/flagdefs/flagdefs.go
index fe2423e..5ccaec4 100644
--- a/metropolis/cli/flagdefs/flagdefs.go
+++ b/metropolis/cli/flagdefs/flagdefs.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 // Package flagdefs contains shared flag definitions for Metropolis.
 // The usage is the same as for the standard flags in the [flag] package,
 // except that the [flag.FlagSet] needs to be passed in the first parameter.
diff --git a/metropolis/cli/metroctl/cmd_certs.go b/metropolis/cli/metroctl/cmd_certs.go
index 9aa0953..7d69a20 100644
--- a/metropolis/cli/metroctl/cmd_certs.go
+++ b/metropolis/cli/metroctl/cmd_certs.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_cluster.go b/metropolis/cli/metroctl/cmd_cluster.go
index e82cb95..a474061 100644
--- a/metropolis/cli/metroctl/cmd_cluster.go
+++ b/metropolis/cli/metroctl/cmd_cluster.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import "github.com/spf13/cobra"
diff --git a/metropolis/cli/metroctl/cmd_cluster_configure.go b/metropolis/cli/metroctl/cmd_cluster_configure.go
index b59246b..73483c1 100644
--- a/metropolis/cli/metroctl/cmd_cluster_configure.go
+++ b/metropolis/cli/metroctl/cmd_cluster_configure.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_cluster_takeownership.go b/metropolis/cli/metroctl/cmd_cluster_takeownership.go
index 068dd3b..3566ea0 100644
--- a/metropolis/cli/metroctl/cmd_cluster_takeownership.go
+++ b/metropolis/cli/metroctl/cmd_cluster_takeownership.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_install.go b/metropolis/cli/metroctl/cmd_install.go
index 9a996b2..1f73d76 100644
--- a/metropolis/cli/metroctl/cmd_install.go
+++ b/metropolis/cli/metroctl/cmd_install.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_install_ssh.go b/metropolis/cli/metroctl/cmd_install_ssh.go
index f779f43..5feda6f 100644
--- a/metropolis/cli/metroctl/cmd_install_ssh.go
+++ b/metropolis/cli/metroctl/cmd_install_ssh.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_install_usb.go b/metropolis/cli/metroctl/cmd_install_usb.go
index e1a22a4..38c1501 100644
--- a/metropolis/cli/metroctl/cmd_install_usb.go
+++ b/metropolis/cli/metroctl/cmd_install_usb.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_k8s_configure.go b/metropolis/cli/metroctl/cmd_k8s_configure.go
index 5ce4032..6509318 100644
--- a/metropolis/cli/metroctl/cmd_k8s_configure.go
+++ b/metropolis/cli/metroctl/cmd_k8s_configure.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_k8scredplugin.go b/metropolis/cli/metroctl/cmd_k8scredplugin.go
index 50bf474..0054e70 100644
--- a/metropolis/cli/metroctl/cmd_k8scredplugin.go
+++ b/metropolis/cli/metroctl/cmd_k8scredplugin.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_node.go b/metropolis/cli/metroctl/cmd_node.go
index a875725..2e0b537 100644
--- a/metropolis/cli/metroctl/cmd_node.go
+++ b/metropolis/cli/metroctl/cmd_node.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_node_approve.go b/metropolis/cli/metroctl/cmd_node_approve.go
index f935bbc..65d2811 100644
--- a/metropolis/cli/metroctl/cmd_node_approve.go
+++ b/metropolis/cli/metroctl/cmd_node_approve.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_node_logs.go b/metropolis/cli/metroctl/cmd_node_logs.go
index b06a9f7..36ccd00 100644
--- a/metropolis/cli/metroctl/cmd_node_logs.go
+++ b/metropolis/cli/metroctl/cmd_node_logs.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_node_metrics.go b/metropolis/cli/metroctl/cmd_node_metrics.go
index 1572147..6b108ae 100644
--- a/metropolis/cli/metroctl/cmd_node_metrics.go
+++ b/metropolis/cli/metroctl/cmd_node_metrics.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/cmd_node_set.go b/metropolis/cli/metroctl/cmd_node_set.go
index 4211aca..677a425 100644
--- a/metropolis/cli/metroctl/cmd_node_set.go
+++ b/metropolis/cli/metroctl/cmd_node_set.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/core/ca_tofu.go b/metropolis/cli/metroctl/core/ca_tofu.go
index b578aa6..3f3c135 100644
--- a/metropolis/cli/metroctl/core/ca_tofu.go
+++ b/metropolis/cli/metroctl/core/ca_tofu.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package core
 
 import (
diff --git a/metropolis/cli/metroctl/core/config.go b/metropolis/cli/metroctl/core/config.go
index d22dd9a..38862af 100644
--- a/metropolis/cli/metroctl/core/config.go
+++ b/metropolis/cli/metroctl/core/config.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package core
 
 import (
diff --git a/metropolis/cli/metroctl/core/core.go b/metropolis/cli/metroctl/core/core.go
index 545a408..8e7e196 100644
--- a/metropolis/cli/metroctl/core/core.go
+++ b/metropolis/cli/metroctl/core/core.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 // Package core contains parts of metroctl which do significant amounts of work
 // beyond just providing a CLI for them.
 // This package is intended to be used for integrating with functions provided
diff --git a/metropolis/cli/metroctl/core/install.go b/metropolis/cli/metroctl/core/install.go
index 4175e22..190f66a 100644
--- a/metropolis/cli/metroctl/core/install.go
+++ b/metropolis/cli/metroctl/core/install.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package core
 
 import (
diff --git a/metropolis/cli/metroctl/core/rpc.go b/metropolis/cli/metroctl/core/rpc.go
index 91d5175..8b377f5 100644
--- a/metropolis/cli/metroctl/core/rpc.go
+++ b/metropolis/cli/metroctl/core/rpc.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package core
 
 import (
diff --git a/metropolis/cli/metroctl/main.go b/metropolis/cli/metroctl/main.go
index 6d26d4c..b5731c6 100644
--- a/metropolis/cli/metroctl/main.go
+++ b/metropolis/cli/metroctl/main.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/rpc.go b/metropolis/cli/metroctl/rpc.go
index cfe1b41..ec3a4e4 100644
--- a/metropolis/cli/metroctl/rpc.go
+++ b/metropolis/cli/metroctl/rpc.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/table_node.go b/metropolis/cli/metroctl/table_node.go
index 0ef23d8..5fcdb25 100644
--- a/metropolis/cli/metroctl/table_node.go
+++ b/metropolis/cli/metroctl/table_node.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/metroctl/test/main_test.go b/metropolis/cli/metroctl/test/main_test.go
index e02f9c1..e1ca606 100644
--- a/metropolis/cli/metroctl/test/main_test.go
+++ b/metropolis/cli/metroctl/test/main_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package test
 
 import (
diff --git a/metropolis/cli/takeover/boot.go b/metropolis/cli/takeover/boot.go
index eb71694..21ca708 100644
--- a/metropolis/cli/takeover/boot.go
+++ b/metropolis/cli/takeover/boot.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/takeover/e2e/main_test.go b/metropolis/cli/takeover/e2e/main_test.go
index 32d7fb8..c9108cd 100644
--- a/metropolis/cli/takeover/e2e/main_test.go
+++ b/metropolis/cli/takeover/e2e/main_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package e2e
 
 import (
diff --git a/metropolis/cli/takeover/install.go b/metropolis/cli/takeover/install.go
index b0c56d0..005b590 100644
--- a/metropolis/cli/takeover/install.go
+++ b/metropolis/cli/takeover/install.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/takeover/main.go b/metropolis/cli/takeover/main.go
index a609a63..97ed7a4 100644
--- a/metropolis/cli/takeover/main.go
+++ b/metropolis/cli/takeover/main.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (
diff --git a/metropolis/cli/takeover/takeover.go b/metropolis/cli/takeover/takeover.go
index 327d3c1..95420dc 100644
--- a/metropolis/cli/takeover/takeover.go
+++ b/metropolis/cli/takeover/takeover.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (