diff --git a/include/tensorwrapper/allocator/allocator_base.hpp b/include/tensorwrapper/allocator/allocator_base.hpp
index aade1915..d918716d 100644
--- a/include/tensorwrapper/allocator/allocator_base.hpp
+++ b/include/tensorwrapper/allocator/allocator_base.hpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #pragma once
 #include <parallelzone/parallelzone.hpp>
 #include <tensorwrapper/buffer/buffer_base.hpp>
diff --git a/include/tensorwrapper/allocator/eigen.hpp b/include/tensorwrapper/allocator/eigen.hpp
index 4ed1004e..d6503df2 100644
--- a/include/tensorwrapper/allocator/eigen.hpp
+++ b/include/tensorwrapper/allocator/eigen.hpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #pragma once
 #include <tensorwrapper/allocator/replicated.hpp>
 #include <tensorwrapper/buffer/eigen.hpp>
diff --git a/include/tensorwrapper/allocator/local.hpp b/include/tensorwrapper/allocator/local.hpp
index b07f1726..c9a82118 100644
--- a/include/tensorwrapper/allocator/local.hpp
+++ b/include/tensorwrapper/allocator/local.hpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #pragma once
 #include <tensorwrapper/allocator/allocator_base.hpp>
 
diff --git a/include/tensorwrapper/allocator/replicated.hpp b/include/tensorwrapper/allocator/replicated.hpp
index 8336b8bd..be537aae 100644
--- a/include/tensorwrapper/allocator/replicated.hpp
+++ b/include/tensorwrapper/allocator/replicated.hpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #pragma once
 #include <tensorwrapper/allocator/local.hpp>
 
diff --git a/include/tensorwrapper/detail_/unique_ptr_utilities.hpp b/include/tensorwrapper/detail_/unique_ptr_utilities.hpp
index 4b8a4fa6..2e18885e 100644
--- a/include/tensorwrapper/detail_/unique_ptr_utilities.hpp
+++ b/include/tensorwrapper/detail_/unique_ptr_utilities.hpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #pragma once
 #include <memory>
 
diff --git a/src/tensorwrapper/allocator/eigen.cpp b/src/tensorwrapper/allocator/eigen.cpp
index f0ea92bc..96f7c035 100644
--- a/src/tensorwrapper/allocator/eigen.cpp
+++ b/src/tensorwrapper/allocator/eigen.cpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #include <tensorwrapper/allocator/eigen.hpp>
 #include <tensorwrapper/detail_/unique_ptr_utilities.hpp>
 #include <tensorwrapper/shape/smooth.hpp>
diff --git a/tests/cxx/unit_tests/tensorwrapper/allocator/eigen.cpp b/tests/cxx/unit_tests/tensorwrapper/allocator/eigen.cpp
index c39d92ee..7924928f 100644
--- a/tests/cxx/unit_tests/tensorwrapper/allocator/eigen.cpp
+++ b/tests/cxx/unit_tests/tensorwrapper/allocator/eigen.cpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #include "../helpers.hpp"
 #include <parallelzone/parallelzone.hpp>
 #include <tensorwrapper/allocator/eigen.hpp>
diff --git a/tests/cxx/unit_tests/tensorwrapper/detail_/unique_ptr_utilities.cpp b/tests/cxx/unit_tests/tensorwrapper/detail_/unique_ptr_utilities.cpp
index 52ecd329..ed9030d3 100644
--- a/tests/cxx/unit_tests/tensorwrapper/detail_/unique_ptr_utilities.cpp
+++ b/tests/cxx/unit_tests/tensorwrapper/detail_/unique_ptr_utilities.cpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 NWChemEx-Project
+ *
+ * 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.
+ */
+
 #include <catch2/catch.hpp>
 #include <tensorwrapper/detail_/unique_ptr_utilities.hpp>
 #include <vector>