diff --git a/cpp/platform/base/byte_utils.cc b/cpp/platform/base/byte_utils.cc
index 1b2a3d85..07af0db5 100644
--- a/cpp/platform/base/byte_utils.cc
+++ b/cpp/platform/base/byte_utils.cc
@@ -1,3 +1,17 @@
+// Copyright 2020 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.
+
 #include "platform/base/byte_utils.h"
 
 #include <cstdlib>
diff --git a/cpp/platform/base/byte_utils.h b/cpp/platform/base/byte_utils.h
index 6770e1fd..e603a5fd 100644
--- a/cpp/platform/base/byte_utils.h
+++ b/cpp/platform/base/byte_utils.h
@@ -1,3 +1,17 @@
+// Copyright 2020 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.
+
 #ifndef PLATFORM_BASE_BYTE_UTILS_H_
 #define PLATFORM_BASE_BYTE_UTILS_H_
 
diff --git a/cpp/platform/base/byte_utils_test.cc b/cpp/platform/base/byte_utils_test.cc
index ed35052c..554a3f6b 100644
--- a/cpp/platform/base/byte_utils_test.cc
+++ b/cpp/platform/base/byte_utils_test.cc
@@ -1,3 +1,17 @@
+// Copyright 2020 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.
+
 #include "platform/base/byte_utils.h"
 
 #include "platform/base/byte_array.h"
diff --git a/cpp/platform/base/nsd_service_info.h b/cpp/platform/base/nsd_service_info.h
index 9b1f7695..4688b918 100644
--- a/cpp/platform/base/nsd_service_info.h
+++ b/cpp/platform/base/nsd_service_info.h
@@ -1,3 +1,17 @@
+// Copyright 2020 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.
+
 #ifndef PLATFORM_BASE_NSD_SERVICE_INFO_H_
 #define PLATFORM_BASE_NSD_SERVICE_INFO_H_