diff --git a/build.rs b/build.rs
index ebbb5ad..be24c12 100644
--- a/build.rs
+++ b/build.rs
@@ -1,3 +1,19 @@
+/********************************************************************************
+ * Copyright (c) 2024 Kopernikus Automotive
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+ 
 use std::env::var;
 
 fn main() {
diff --git a/demo/build.rs b/demo/build.rs
index 4780847..ff81502 100644
--- a/demo/build.rs
+++ b/demo/build.rs
@@ -1,3 +1,19 @@
+/********************************************************************************
+ * Copyright (c) 2024 Kopernikus Automotive
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+ 
 use std::env;
 use std::path::PathBuf;
 
diff --git a/demo/src/ecal_rs.rs b/demo/src/ecal_rs.rs
index 0351525..8ca8045 100644
--- a/demo/src/ecal_rs.rs
+++ b/demo/src/ecal_rs.rs
@@ -1,3 +1,19 @@
+/********************************************************************************
+ * Copyright (c) 2024 Kopernikus Automotive
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+ 
 /// topic: /kpns/test/ping
 #[derive(Clone, PartialEq, ::prost::Message, ecal::Message)]
 #[type_prefix = "kpns_msgs."]
diff --git a/demo/src/main.rs b/demo/src/main.rs
index c35b40c..ae49314 100644
--- a/demo/src/main.rs
+++ b/demo/src/main.rs
@@ -1,3 +1,19 @@
+/********************************************************************************
+ * Copyright (c) 2024 Kopernikus Automotive
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+ 
 use anyhow::Result;
 use clap::Parser;
 use std::sync::{
diff --git a/ecal-derive/src/lib.rs b/ecal-derive/src/lib.rs
index 35c535f..72d266f 100644
--- a/ecal-derive/src/lib.rs
+++ b/ecal-derive/src/lib.rs
@@ -1,3 +1,19 @@
+/********************************************************************************
+ * Copyright (c) 2024 Kopernikus Automotive
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+ 
 extern crate proc_macro;
 
 use proc_macro::TokenStream;
diff --git a/src/sys.rs b/src/sys.rs
index 010ab8d..fdb3312 100644
--- a/src/sys.rs
+++ b/src/sys.rs
@@ -1,3 +1,19 @@
+/********************************************************************************
+ * Copyright (c) 2024 Kopernikus Automotive
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+ 
 #![allow(non_camel_case_types)]
 #![allow(non_upper_case_globals)]
 #![allow(non_snake_case)]