diff --git a/matter/src/codec/base38.rs b/matter/src/codec/base38.rs
index bd6113f..8bea287 100644
--- a/matter/src/codec/base38.rs
+++ b/matter/src/codec/base38.rs
@@ -1,4 +1,22 @@
+/*
+ *
+ *    Copyright (c) 2020-2022 Project CHIP Authors
+ *
+ *    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.
+ */
+
 //! Base38 encoding functions.
+
 const BASE38_CHARS: &str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-.";
 
 /// Encodes a byte array into a base38 string.
diff --git a/matter/src/mdns.rs b/matter/src/mdns.rs
index 07f464a..194dcc2 100644
--- a/matter/src/mdns.rs
+++ b/matter/src/mdns.rs
@@ -1,3 +1,20 @@
+/*
+ *
+ *    Copyright (c) 2020-2022 Project CHIP Authors
+ *
+ *    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 std::sync::{Arc, Mutex, Once};
 
 use crate::{
diff --git a/matter/src/pairing.rs b/matter/src/pairing.rs
index a367ba4..070fb0e 100644
--- a/matter/src/pairing.rs
+++ b/matter/src/pairing.rs
@@ -1,3 +1,20 @@
+/*
+ *
+ *    Copyright (c) 2020-2022 Project CHIP Authors
+ *
+ *    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.
+ */
+
 //! This module contains the logic for generating the pairing code and the QR code for easy pairing.
 
 use log::info;