diff --git a/Cargo.toml b/Cargo.toml
index 31f9e7f..802dcd7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,17 @@
+# Copyright 2024 Spiral, Inc.
+#
+# 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.
+
 [package]
 name = "fsst-rs"
 version = "0.0.1"
diff --git a/benches/compress.rs b/benches/compress.rs
index 9581c9c..f2fa6b2 100644
--- a/benches/compress.rs
+++ b/benches/compress.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 Spiral, Inc.
+//
+// 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.
+
 //! Compression benchmark.
 //!
 //! Contains benchmarks for FSST compression, decompression, and symbol table training.
diff --git a/examples/round_trip.rs b/examples/round_trip.rs
index 0f3fab7..8681230 100644
--- a/examples/round_trip.rs
+++ b/examples/round_trip.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 Spiral, Inc.
+//
+// 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.
+
 //! Simple example where we show round-tripping a string through the static symbol table.
 
 use core::str;
diff --git a/src/lossy_pht.rs b/src/lossy_pht.rs
index f7ca6c0..9982665 100644
--- a/src/lossy_pht.rs
+++ b/src/lossy_pht.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 Spiral, Inc.
+//
+// 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::Debug;
 
 use crate::CodeMeta;
diff --git a/tests/correctness.rs b/tests/correctness.rs
index 31bde28..52ebe10 100644
--- a/tests/correctness.rs
+++ b/tests/correctness.rs
@@ -1,3 +1,17 @@
+// Copyright 2024 Spiral, Inc.
+//
+// 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(test)]
 
 static PREAMBLE: &str = r#"