diff --git a/conformance/client_config.yaml b/conformance/client_config.yaml
index b34a092..36122ef 100644
--- a/conformance/client_config.yaml
+++ b/conformance/client_config.yaml
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 features:
   versions:
     - HTTP_VERSION_1
diff --git a/conformance/client_known_flaky.yaml b/conformance/client_known_flaky.yaml
index 436bc38..702d25e 100644
--- a/conformance/client_known_flaky.yaml
+++ b/conformance/client_known_flaky.yaml
@@ -1 +1,17 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 Client Cancellation/**
diff --git a/conformance/client_runner.py b/conformance/client_runner.py
index 3b43719..e8643ea 100755
--- a/conformance/client_runner.py
+++ b/conformance/client_runner.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Module implements a client runner for conformance testing."""
 
 import asyncio
diff --git a/conformance/server.py b/conformance/server.py
index 26d1f2d..6395482 100644
--- a/conformance/server.py
+++ b/conformance/server.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Module implementing the ConformanceService for testing connect conformance."""
 
 import asyncio
diff --git a/conformance/server_config.yaml b/conformance/server_config.yaml
index b4004bb..b22aea7 100644
--- a/conformance/server_config.yaml
+++ b/conformance/server_config.yaml
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 features:
   versions:
     - HTTP_VERSION_1
diff --git a/conformance/server_known_flaky.yaml b/conformance/server_known_flaky.yaml
index 9cad4d2..d511e5c 100644
--- a/conformance/server_known_flaky.yaml
+++ b/conformance/server_known_flaky.yaml
@@ -1 +1,17 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 Timeouts/**
diff --git a/conformance/tls.py b/conformance/tls.py
index 09506b3..c8f19a6 100644
--- a/conformance/tls.py
+++ b/conformance/tls.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Module provides functionality to create a new client TLS configuration."""
 
 import os
diff --git a/examples/__init__.py b/examples/__init__.py
index e69de29..1926cef 100644
--- a/examples/__init__.py
+++ b/examples/__init__.py
@@ -0,0 +1,15 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
diff --git a/examples/client.py b/examples/client.py
index 0a96219..74171a3 100644
--- a/examples/client.py
+++ b/examples/client.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Main module for the tests."""
 
 import argparse
diff --git a/examples/eliza.py b/examples/eliza.py
index 266e8cf..659b079 100644
--- a/examples/eliza.py
+++ b/examples/eliza.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 import random
 import re
 from re import Pattern
diff --git a/examples/server.py b/examples/server.py
index 3bba0bc..939b820 100644
--- a/examples/server.py
+++ b/examples/server.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Main module for the tests."""
 
 import asyncio
diff --git a/src/connect/__init__.py b/src/connect/__init__.py
index 260b428..bd3ee38 100644
--- a/src/connect/__init__.py
+++ b/src/connect/__init__.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Connect-Python: A Python implementation of the Connect protocol."""
 
 from connect.call_options import CallOptions
diff --git a/src/connect/asgi_helpers/__init__.py b/src/connect/asgi_helpers/__init__.py
index e69de29..1926cef 100644
--- a/src/connect/asgi_helpers/__init__.py
+++ b/src/connect/asgi_helpers/__init__.py
@@ -0,0 +1,15 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
diff --git a/src/connect/asgi_helpers/utils.py b/src/connect/asgi_helpers/utils.py
index 2002c93..b31382f 100644
--- a/src/connect/asgi_helpers/utils.py
+++ b/src/connect/asgi_helpers/utils.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Utility functions for ASGI helpers, including request/response decorators and route path extraction."""
 
 import typing
diff --git a/src/connect/call_options.py b/src/connect/call_options.py
index 88983fa..6e47a9b 100644
--- a/src/connect/call_options.py
+++ b/src/connect/call_options.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Call options configuration models."""
 
 import asyncio
diff --git a/src/connect/client.py b/src/connect/client.py
index 11b53df..a0b0b63 100644
--- a/src/connect/client.py
+++ b/src/connect/client.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Provides the main client implementation for making Connect protocol RPCs."""
 
 import contextlib
diff --git a/src/connect/client_interceptor.py b/src/connect/client_interceptor.py
index 6d19f2b..abe98f4 100644
--- a/src/connect/client_interceptor.py
+++ b/src/connect/client_interceptor.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Client-side interceptor utilities for modifying RPC behavior in Connect Python."""
 
 import inspect
diff --git a/src/connect/code.py b/src/connect/code.py
index 6b495b9..5bf30fb 100644
--- a/src/connect/code.py
+++ b/src/connect/code.py
@@ -1,4 +1,17 @@
-# Copyright 2024 Gaudiy, Inc.
+# Copyright 2025 Gaudiy 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.
+#
 # SPDX-License-Identifier: Apache-2.0
 
 """Connect represents categories of errors as codes."""
diff --git a/src/connect/codec.py b/src/connect/codec.py
index 4f8ae68..3385056 100644
--- a/src/connect/codec.py
+++ b/src/connect/codec.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Module providing codec classes for serializing and deserializing protobuf messages."""
 
 import abc
diff --git a/src/connect/compression.py b/src/connect/compression.py
index 5cca446..9498160 100644
--- a/src/connect/compression.py
+++ b/src/connect/compression.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Module providing constants for different types of compression."""
 
 import abc
diff --git a/src/connect/connect.py b/src/connect/connect.py
index ec6b6c3..a7b1800 100644
--- a/src/connect/connect.py
+++ b/src/connect/connect.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Core components and abstractions for the Connect protocol."""
 
 import abc
diff --git a/src/connect/connection_pool.py b/src/connect/connection_pool.py
index 8818794..30afddf 100644
--- a/src/connect/connection_pool.py
+++ b/src/connect/connection_pool.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Provides an asynchronous connection pool for making HTTP requests."""
 
 from httpcore import AsyncConnectionPool as AsyncConnectionPool
diff --git a/src/connect/content_stream.py b/src/connect/content_stream.py
index 5bf8441..57b9a45 100644
--- a/src/connect/content_stream.py
+++ b/src/connect/content_stream.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Provides classes for handling asynchronous content and data streams."""
 
 from collections.abc import (
diff --git a/src/connect/envelope.py b/src/connect/envelope.py
index ac46d2e..f9dc9cc 100644
--- a/src/connect/envelope.py
+++ b/src/connect/envelope.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Module containing the Envelope class which represents a data envelope."""
 
 import struct
diff --git a/src/connect/error.py b/src/connect/error.py
index cbbd91e..80809cb 100644
--- a/src/connect/error.py
+++ b/src/connect/error.py
@@ -1,4 +1,17 @@
-# Copyright 2024 Gaudiy, Inc.
+# Copyright 2025 Gaudiy 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.
+#
 # SPDX-License-Identifier: Apache-2.0
 
 """Defines Connect protocol errors and related utilities."""
diff --git a/src/connect/handler.py b/src/connect/handler.py
index 82a7c9b..8e70f2f 100644
--- a/src/connect/handler.py
+++ b/src/connect/handler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Defines the server-side handlers for Connect, gRPC, and gRPC-Web RPCs."""
 
 import asyncio
diff --git a/src/connect/handler_context.py b/src/connect/handler_context.py
index 33f9450..fffa639 100644
--- a/src/connect/handler_context.py
+++ b/src/connect/handler_context.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Manages the context for a handler, particularly for handling timeouts."""
 
 import time
diff --git a/src/connect/handler_interceptor.py b/src/connect/handler_interceptor.py
index a7b7090..6f5de44 100644
--- a/src/connect/handler_interceptor.py
+++ b/src/connect/handler_interceptor.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Defines handler-side interceptors for the Connect RPC framework."""
 
 import inspect
diff --git a/src/connect/headers.py b/src/connect/headers.py
index 2f3fb93..0af1e0c 100644
--- a/src/connect/headers.py
+++ b/src/connect/headers.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Provides a `Headers` class for managing HTTP headers and a utility function for request headers."""
 
 from collections.abc import AsyncIterable, Iterable, Iterator, KeysView, Mapping, MutableMapping, Sequence
diff --git a/src/connect/idempotency_level.py b/src/connect/idempotency_level.py
index 43d9a5e..5d1e605 100644
--- a/src/connect/idempotency_level.py
+++ b/src/connect/idempotency_level.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Defines the IdempotencyLevel enumeration."""
 
 from enum import IntEnum
diff --git a/src/connect/middleware.py b/src/connect/middleware.py
index b4e004b..872f793 100644
--- a/src/connect/middleware.py
+++ b/src/connect/middleware.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Provides ASGI middleware for routing requests to Connect protocol handlers."""
 
 from collections.abc import Awaitable, Callable
diff --git a/src/connect/options.py b/src/connect/options.py
index 89460e0..745146f 100644
--- a/src/connect/options.py
+++ b/src/connect/options.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Defines configuration options for Connect RPC clients and handlers."""
 
 from typing import Any, Literal
diff --git a/src/connect/protocol.py b/src/connect/protocol.py
index ded1d62..f1f8c72 100644
--- a/src/connect/protocol.py
+++ b/src/connect/protocol.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Defines the abstract interfaces and helpers for RPC protocol implementations."""
 
 import abc
diff --git a/src/connect/protocol_connect/__init__.py b/src/connect/protocol_connect/__init__.py
index e69de29..1926cef 100644
--- a/src/connect/protocol_connect/__init__.py
+++ b/src/connect/protocol_connect/__init__.py
@@ -0,0 +1,15 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
diff --git a/src/connect/protocol_connect/base64_utils.py b/src/connect/protocol_connect/base64_utils.py
index 4bf8fcf..c767583 100644
--- a/src/connect/protocol_connect/base64_utils.py
+++ b/src/connect/protocol_connect/base64_utils.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Base64 utilities for Connect protocol."""
 
 import base64
diff --git a/src/connect/protocol_connect/connect_client.py b/src/connect/protocol_connect/connect_client.py
index 22ec274..53f94e7 100644
--- a/src/connect/protocol_connect/connect_client.py
+++ b/src/connect/protocol_connect/connect_client.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Connect protocol client implementation for unary and streaming RPCs."""
 
 import asyncio
diff --git a/src/connect/protocol_connect/connect_handler.py b/src/connect/protocol_connect/connect_handler.py
index f792a48..204bb4b 100644
--- a/src/connect/protocol_connect/connect_handler.py
+++ b/src/connect/protocol_connect/connect_handler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Connect protocol handler implementation for unary and streaming RPCs."""
 
 import json
diff --git a/src/connect/protocol_connect/connect_protocol.py b/src/connect/protocol_connect/connect_protocol.py
index 91a334b..4f81c2b 100644
--- a/src/connect/protocol_connect/connect_protocol.py
+++ b/src/connect/protocol_connect/connect_protocol.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Provides the ProtocolConnect class for handling connection protocols."""
 
 from http import HTTPMethod
diff --git a/src/connect/protocol_connect/constants.py b/src/connect/protocol_connect/constants.py
index 56d2a8b..8b2a485 100644
--- a/src/connect/protocol_connect/constants.py
+++ b/src/connect/protocol_connect/constants.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Constants for Connect protocol headers, content types, and user agent."""
 
 import sys
diff --git a/src/connect/protocol_connect/content_type.py b/src/connect/protocol_connect/content_type.py
index bc14d07..f7b0374 100644
--- a/src/connect/protocol_connect/content_type.py
+++ b/src/connect/protocol_connect/content_type.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Helpers for Connect protocol content type handling."""
 
 from http import HTTPStatus
diff --git a/src/connect/protocol_connect/end_stream.py b/src/connect/protocol_connect/end_stream.py
index 09a25e5..18623ff 100644
--- a/src/connect/protocol_connect/end_stream.py
+++ b/src/connect/protocol_connect/end_stream.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Helpers for serializing and deserializing Connect end-of-stream messages."""
 
 import json
diff --git a/src/connect/protocol_connect/error_code.py b/src/connect/protocol_connect/error_code.py
index 06ec115..98dcb81 100644
--- a/src/connect/protocol_connect/error_code.py
+++ b/src/connect/protocol_connect/error_code.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """HTTP status code mapping for Connect protocol error codes."""
 
 from connect.code import Code
diff --git a/src/connect/protocol_connect/error_json.py b/src/connect/protocol_connect/error_json.py
index 6c939f1..895ba3d 100644
--- a/src/connect/protocol_connect/error_json.py
+++ b/src/connect/protocol_connect/error_json.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Utilities for serializing and deserializing ConnectError objects to and from JSON."""
 
 import contextlib
diff --git a/src/connect/protocol_connect/marshaler.py b/src/connect/protocol_connect/marshaler.py
index 501f18b..c896fb9 100644
--- a/src/connect/protocol_connect/marshaler.py
+++ b/src/connect/protocol_connect/marshaler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Marshaling utilities for Connect protocol unary and streaming messages."""
 
 import base64
diff --git a/src/connect/protocol_connect/unmarshaler.py b/src/connect/protocol_connect/unmarshaler.py
index aef0e15..0f7abd3 100644
--- a/src/connect/protocol_connect/unmarshaler.py
+++ b/src/connect/protocol_connect/unmarshaler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Connect protocol message unmarshaling utilities."""
 
 from collections.abc import (
diff --git a/src/connect/protocol_grpc/__init__.py b/src/connect/protocol_grpc/__init__.py
index e69de29..1926cef 100644
--- a/src/connect/protocol_grpc/__init__.py
+++ b/src/connect/protocol_grpc/__init__.py
@@ -0,0 +1,15 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
diff --git a/src/connect/protocol_grpc/constants.py b/src/connect/protocol_grpc/constants.py
index cea8759..6690b26 100644
--- a/src/connect/protocol_grpc/constants.py
+++ b/src/connect/protocol_grpc/constants.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Constants and settings for gRPC protocol support in connect-python."""
 
 import re
diff --git a/src/connect/protocol_grpc/content_type.py b/src/connect/protocol_grpc/content_type.py
index 6cfc4ff..ea124b0 100644
--- a/src/connect/protocol_grpc/content_type.py
+++ b/src/connect/protocol_grpc/content_type.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Utilities for handling gRPC and gRPC-Web content types and codec validation."""
 
 from connect.code import Code
diff --git a/src/connect/protocol_grpc/error_trailer.py b/src/connect/protocol_grpc/error_trailer.py
index 9f2c9bb..acd4a27 100644
--- a/src/connect/protocol_grpc/error_trailer.py
+++ b/src/connect/protocol_grpc/error_trailer.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Helpers for encoding and decoding gRPC error trailers in Connect protocol."""
 
 import base64
diff --git a/src/connect/protocol_grpc/grpc_client.py b/src/connect/protocol_grpc/grpc_client.py
index 6cb9115..e2430a6 100644
--- a/src/connect/protocol_grpc/grpc_client.py
+++ b/src/connect/protocol_grpc/grpc_client.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """gRPC protocol client implementation for asynchronous Python clients."""
 
 import asyncio
diff --git a/src/connect/protocol_grpc/grpc_handler.py b/src/connect/protocol_grpc/grpc_handler.py
index dd82a87..b7687fb 100644
--- a/src/connect/protocol_grpc/grpc_handler.py
+++ b/src/connect/protocol_grpc/grpc_handler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """gRPC and gRPC-web protocol handler and connection classes for Connect Python framework."""
 
 from collections.abc import AsyncIterable, AsyncIterator
diff --git a/src/connect/protocol_grpc/grpc_protocol.py b/src/connect/protocol_grpc/grpc_protocol.py
index 955e87c..64a3068 100644
--- a/src/connect/protocol_grpc/grpc_protocol.py
+++ b/src/connect/protocol_grpc/grpc_protocol.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """gRPC and gRPC-Web protocol implementation for Connect framework."""
 
 from connect.codec import CodecNameType
diff --git a/src/connect/protocol_grpc/marshaler.py b/src/connect/protocol_grpc/marshaler.py
index 59e6354..5338c2b 100644
--- a/src/connect/protocol_grpc/marshaler.py
+++ b/src/connect/protocol_grpc/marshaler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """gRPC-Web marshaler for serializing messages and trailers with optional compression."""
 
 from connect.codec import Codec
diff --git a/src/connect/protocol_grpc/unmarshaler.py b/src/connect/protocol_grpc/unmarshaler.py
index f92bf7b..52a28b1 100644
--- a/src/connect/protocol_grpc/unmarshaler.py
+++ b/src/connect/protocol_grpc/unmarshaler.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """GRPCUnmarshaler provides async gRPC message unmarshaling with web trailer support."""
 
 from collections.abc import AsyncIterable, AsyncIterator
diff --git a/src/connect/request.py b/src/connect/request.py
index c193cb1..a16a3c9 100644
--- a/src/connect/request.py
+++ b/src/connect/request.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """HTTP request handling module using Starlette's Request class."""
 
 from starlette.requests import Request as Request
diff --git a/src/connect/response.py b/src/connect/response.py
index fc69fbc..1028d2f 100644
--- a/src/connect/response.py
+++ b/src/connect/response.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Streaming HTTP response implementation with async content delivery and trailer support."""
 
 import typing
diff --git a/src/connect/response_writer.py b/src/connect/response_writer.py
index 6c56691..ffd3348 100644
--- a/src/connect/response_writer.py
+++ b/src/connect/response_writer.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Single-use asynchronous response writer for server communication with thread-safe queue mechanism."""
 
 import asyncio
diff --git a/src/connect/utils.py b/src/connect/utils.py
index 829c8d4..540863b 100644
--- a/src/connect/utils.py
+++ b/src/connect/utils.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 """Utility functions for async operations, HTTP exception handling, and callable attribute inspection."""
 
 import asyncio
diff --git a/src/connect/version.py b/src/connect/version.py
index 8c1bdfd..01ee7de 100644
--- a/src/connect/version.py
+++ b/src/connect/version.py
@@ -1,4 +1,17 @@
-# Copyright 2024 Gaudiy, Inc.
+# Copyright 2025 Gaudiy 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.
+#
 # SPDX-License-Identifier: Apache-2.0
 
 __version__ = "0.0.1"
diff --git a/tests/__init__.py b/tests/__init__.py
index e69de29..1926cef 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -0,0 +1,15 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
diff --git a/tests/conftest.py b/tests/conftest.py
index 577d824..20e1645 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa: ARG001 ARG002 D100 D101 D102 D103 D105 D107
 
 import json
diff --git a/tests/test_streaming_connect_client.py b/tests/test_streaming_connect_client.py
index 25c5e39..a4f82c9 100644
--- a/tests/test_streaming_connect_client.py
+++ b/tests/test_streaming_connect_client.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa: ARG001 D103 D100
 
 
diff --git a/tests/test_streaming_connect_server.py b/tests/test_streaming_connect_server.py
index 5bf1909..5cfa53a 100644
--- a/tests/test_streaming_connect_server.py
+++ b/tests/test_streaming_connect_server.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 import gzip
 import json
 from collections.abc import AsyncIterator
diff --git a/tests/test_unary_connect_client.py b/tests/test_unary_connect_client.py
index 9543fb4..5b961ee 100644
--- a/tests/test_unary_connect_client.py
+++ b/tests/test_unary_connect_client.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa: ARG001 D103 D100
 
 import base64
diff --git a/tests/test_unary_connect_server.py b/tests/test_unary_connect_server.py
index 05419ec..7d19f3d 100644
--- a/tests/test_unary_connect_server.py
+++ b/tests/test_unary_connect_server.py
@@ -1,3 +1,19 @@
+# Copyright 2025 Gaudiy 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa: ARG001 D103 D100
 
 import base64