diff --git a/cpp/core/internal/fuzzers/BUILD b/cpp/core/internal/fuzzers/BUILD
index 0c113e12..ca304322 100644
--- a/cpp/core/internal/fuzzers/BUILD
+++ b/cpp/core/internal/fuzzers/BUILD
@@ -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.
+
 load("//security/fuzzing/blaze:cc_fuzz_target.bzl", "cc_fuzz_target")
 
 cc_fuzz_target(
diff --git a/cpp/core/internal/fuzzers/offline_frames_fuzzer.cc b/cpp/core/internal/fuzzers/offline_frames_fuzzer.cc
index 50a6062d..432970d2 100644
--- a/cpp/core/internal/fuzzers/offline_frames_fuzzer.cc
+++ b/cpp/core/internal/fuzzers/offline_frames_fuzzer.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 "core/internal/offline_frames.h"
 #include "platform/base/byte_array.h"
 
diff --git a/cpp/platform/base/cancellation_flag.cc b/cpp/platform/base/cancellation_flag.cc
index 1bb6e062..c8943275 100644
--- a/cpp/platform/base/cancellation_flag.cc
+++ b/cpp/platform/base/cancellation_flag.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/cancellation_flag.h"
 
 namespace location {
diff --git a/cpp/platform/base/cancellation_flag.h b/cpp/platform/base/cancellation_flag.h
index 4ef3f1ba..a9cd9450 100644
--- a/cpp/platform/base/cancellation_flag.h
+++ b/cpp/platform/base/cancellation_flag.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_CANCELLATION_FLAG_H_
 #define PLATFORM_BASE_CANCELLATION_FLAG_H_
 
diff --git a/cpp/platform/base/cancellation_flag_test.cc b/cpp/platform/base/cancellation_flag_test.cc
index 32d79e0d..d80836c2 100644
--- a/cpp/platform/base/cancellation_flag_test.cc
+++ b/cpp/platform/base/cancellation_flag_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/cancellation_flag.h"
 
 #include "gtest/gtest.h"