diff --git a/src/config/builder.rs b/src/config/builder.rs
index cb001bce6a..c6e50cb7d5 100644
--- a/src/config/builder.rs
+++ b/src/config/builder.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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 super::{Config, Filter};
 use crate::config::{EndPoint, Proxy, ProxyMode, Source, Version};
 
diff --git a/src/config/endpoints.rs b/src/config/endpoints.rs
index 969b2354b4..f08e0ce7ba 100644
--- a/src/config/endpoints.rs
+++ b/src/config/endpoints.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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::config::EndPoint;
 use std::sync::Arc;
 
diff --git a/src/config/error.rs b/src/config/error.rs
index 888489280b..05c9de32a3 100644
--- a/src/config/error.rs
+++ b/src/config/error.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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::extensions::Error as FilterRegistryError;
 use std::fmt::{self, Display, Formatter};
 
diff --git a/src/proxy/builder.rs b/src/proxy/builder.rs
index 60e41e8ab8..a8d4a08250 100644
--- a/src/proxy/builder.rs
+++ b/src/proxy/builder.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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::config::{Config, ValidationError};
 use crate::extensions::{default_registry, CreateFilterError, FilterChain, FilterRegistry};
 use crate::proxy::server::metrics::Metrics as ProxyMetrics;
diff --git a/src/proxy/metrics.rs b/src/proxy/metrics.rs
index 58faeb362b..4d13d72c02 100644
--- a/src/proxy/metrics.rs
+++ b/src/proxy/metrics.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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::proxy::sessions::metrics::Metrics as SessionMetrics;
 use prometheus::{Encoder, Registry, Result as MetricsResult, TextEncoder};
 use slog::{info, warn, Logger};
diff --git a/src/proxy/server/error.rs b/src/proxy/server/error.rs
index ee3f09d62c..261ed24df0 100644
--- a/src/proxy/server/error.rs
+++ b/src/proxy/server/error.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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::proxy::sessions::error::Error as SessionError;
 use std::fmt::{self, Display, Formatter};
 
diff --git a/src/proxy/sessions/error.rs b/src/proxy/sessions/error.rs
index 5acad1d26b..78ccfa2675 100644
--- a/src/proxy/sessions/error.rs
+++ b/src/proxy/sessions/error.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Google LLC All Rights Reserved.
+ *
+ * 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::fmt::{self, Display, Formatter};
 
 #[derive(Debug)]