diff --git a/src/compressor.rs b/src/compressor.rs
index 6c245aa..d34761d 100644
--- a/src/compressor.rs
+++ b/src/compressor.rs
@@ -1,3 +1,17 @@
+// Copyright 2018 New Vector Ltd
+//
+// 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 is the actual compression algorithm.
 //!
 //! The algorithm attempts to make a tree of deltas for the state group maps.
diff --git a/src/database.rs b/src/database.rs
index e74012a..4efcbee 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -1,3 +1,17 @@
+// Copyright 2018 New Vector Ltd
+//
+// 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 fallible_iterator::FallibleIterator;
 use indicatif::{ProgressBar, ProgressStyle};
 use postgres::{Connection, TlsMode};
diff --git a/src/main.rs b/src/main.rs
index c567f3f..eff38f8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,18 @@
+// Copyright 2018 New Vector Ltd
+//
+// 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 is a tool that attempts to further compress state maps within a
 //! Synapse instance's database. Specifically, it aims to reduce the number of
 //! rows that a given room takes up in the `state_groups_state` table.