diff --git a/tools/nixery/popcount/popcount.go b/tools/nixery/popcount/popcount.go
index a37408e37..bc5f42af8 100644
--- a/tools/nixery/popcount/popcount.go
+++ b/tools/nixery/popcount/popcount.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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.
+
 // Popcount fetches popularity information for each store path in a
 // given Nix channel from the upstream binary cache.
 //
diff --git a/tools/nixery/server/builder/archive.go b/tools/nixery/server/builder/archive.go
index a3fb99882..e0fb76d44 100644
--- a/tools/nixery/server/builder/archive.go
+++ b/tools/nixery/server/builder/archive.go
@@ -1,3 +1,16 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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 builder
 
 // This file implements logic for walking through a directory and creating a
diff --git a/tools/nixery/server/layers/grouping.go b/tools/nixery/server/layers/grouping.go
index 74952a137..3902c8a4e 100644
--- a/tools/nixery/server/layers/grouping.go
+++ b/tools/nixery/server/layers/grouping.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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.
+
 // This package reads an export reference graph (i.e. a graph representing the
 // runtime dependencies of a set of derivations) created by Nix and groups it in
 // a way that is likely to match the grouping for other derivation sets with
diff --git a/tools/nixery/server/logs.go b/tools/nixery/server/logs.go
index 7077b2b20..3179402e2 100644
--- a/tools/nixery/server/logs.go
+++ b/tools/nixery/server/logs.go
@@ -1,3 +1,16 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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
 
 // This file configures different log formatters via logrus. The
diff --git a/tools/nixery/server/manifest/manifest.go b/tools/nixery/server/manifest/manifest.go
index 8ad828239..11fef3ff0 100644
--- a/tools/nixery/server/manifest/manifest.go
+++ b/tools/nixery/server/manifest/manifest.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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 image implements logic for creating the image metadata
 // (such as the image manifest and configuration).
 package manifest
diff --git a/tools/nixery/server/storage/filesystem.go b/tools/nixery/server/storage/filesystem.go
index 3fb91bc5e..cdbc31c5e 100644
--- a/tools/nixery/server/storage/filesystem.go
+++ b/tools/nixery/server/storage/filesystem.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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.
+
 // Filesystem storage backend for Nixery.
 package storage
 
diff --git a/tools/nixery/server/storage/gcs.go b/tools/nixery/server/storage/gcs.go
index 5cb673c15..c247cca62 100644
--- a/tools/nixery/server/storage/gcs.go
+++ b/tools/nixery/server/storage/gcs.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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.
+
 // Google Cloud Storage backend for Nixery.
 package storage
 
diff --git a/tools/nixery/server/storage/storage.go b/tools/nixery/server/storage/storage.go
index 70095cba4..c97b5e4fa 100644
--- a/tools/nixery/server/storage/storage.go
+++ b/tools/nixery/server/storage/storage.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google LLC
+//
+// 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
+//
+//     https://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 storage implements an interface that can be implemented by
 // storage backends, such as Google Cloud Storage or the local
 // filesystem.