diff --git a/src/api/firmware_protection.rs b/src/api/firmware_protection.rs
index 9f73b3c..924d314 100644
--- a/src/api/firmware_protection.rs
+++ b/src/api/firmware_protection.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 pub trait FirmwareProtection {
     /// Locks the firmware.
     ///
diff --git a/src/api/mod.rs b/src/api/mod.rs
index e864df6..8e409f6 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 //! APIs for the environment.
 //!
 //! The [environment](crate::env::Env) is split into components. Each component has an API described
diff --git a/src/clock.rs b/src/clock.rs
index f157e73..04a868d 100644
--- a/src/clock.rs
+++ b/src/clock.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 #[cfg(not(feature = "std"))]
 use alloc::fmt;
 use embedded_time::duration::Milliseconds;
diff --git a/src/env/mod.rs b/src/env/mod.rs
index 3ac5c2f..01b7f3a 100644
--- a/src/env/mod.rs
+++ b/src/env/mod.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 use crate::api::connection::HidConnection;
 use crate::api::customization::Customization;
 use crate::api::firmware_protection::FirmwareProtection;
diff --git a/src/env/test/customization.rs b/src/env/test/customization.rs
index 42d4425..e6fe45e 100644
--- a/src/env/test/customization.rs
+++ b/src/env/test/customization.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 use crate::api::customization::{Customization, CustomizationImpl};
 use crate::ctap::data_formats::{CredentialProtectionPolicy, EnterpriseAttestationMode};
 use alloc::string::String;
diff --git a/src/env/test/mod.rs b/src/env/test/mod.rs
index 80d4543..d936577 100644
--- a/src/env/test/mod.rs
+++ b/src/env/test/mod.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 use self::upgrade_storage::BufferUpgradeStorage;
 use crate::api::connection::{HidConnection, SendOrRecvResult, SendOrRecvStatus};
 use crate::api::customization::DEFAULT_CUSTOMIZATION;
diff --git a/src/env/tock/mod.rs b/src/env/tock/mod.rs
index 1c2b179..9d124ca 100644
--- a/src/env/tock/mod.rs
+++ b/src/env/tock/mod.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 pub use self::storage::{TockStorage, TockUpgradeStorage};
 use crate::api::connection::{HidConnection, SendOrRecvError, SendOrRecvResult, SendOrRecvStatus};
 use crate::api::customization::{CustomizationImpl, DEFAULT_CUSTOMIZATION};
diff --git a/src/test_helpers/mod.rs b/src/test_helpers/mod.rs
index b7b7de6..968e25a 100644
--- a/src/test_helpers/mod.rs
+++ b/src/test_helpers/mod.rs
@@ -1,3 +1,17 @@
+// Copyright 2022 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
+//
+//      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.
+
 use crate::clock::CtapInstant;
 use crate::ctap::command::{
     AuthenticatorAttestationMaterial, AuthenticatorConfigParameters,