diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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diff --git a/alternator/__init__.py b/alternator/__init__.py
index 2cf21a1..a41759c 100644
--- a/alternator/__init__.py
+++ b/alternator/__init__.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """
 Alternator Load Balancing Client for Python.
 
diff --git a/alternator/_constants.py b/alternator/_constants.py
index 28c93f3..6adf1bb 100644
--- a/alternator/_constants.py
+++ b/alternator/_constants.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Shared constants for Alternator client modules."""
 
 # Attribute names used to store manager and pk_cache references on boto3 clients
diff --git a/alternator/_http.py b/alternator/_http.py
index d7cdbca..d722165 100644
--- a/alternator/_http.py
+++ b/alternator/_http.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """HTTP client helpers for node discovery."""
 
 from __future__ import annotations
diff --git a/alternator/_version.py b/alternator/_version.py
index b66edad..98a8479 100644
--- a/alternator/_version.py
+++ b/alternator/_version.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Version information for alternator."""
 
 __version__ = "1.0.0"
diff --git a/alternator/async_client.py b/alternator/async_client.py
index dc1541c..8afc347 100644
--- a/alternator/async_client.py
+++ b/alternator/async_client.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Asynchronous client factory for Alternator load balancing."""
 
 from __future__ import annotations
diff --git a/alternator/client.py b/alternator/client.py
index 385581d..7012fbb 100644
--- a/alternator/client.py
+++ b/alternator/client.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Synchronous client factory for Alternator load balancing."""
 
 from __future__ import annotations
diff --git a/alternator/config.py b/alternator/config.py
index fc98a8a..7d753cd 100644
--- a/alternator/config.py
+++ b/alternator/config.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Configuration classes for Alternator load balancing client."""
 
 from __future__ import annotations
diff --git a/alternator/core/__init__.py b/alternator/core/__init__.py
index ea22462..9e46094 100644
--- a/alternator/core/__init__.py
+++ b/alternator/core/__init__.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Core modules for Alternator load balancing."""
 
 from alternator.core.live_nodes import (
diff --git a/alternator/core/auth.py b/alternator/core/auth.py
index 8aa5614..6084f58 100644
--- a/alternator/core/auth.py
+++ b/alternator/core/auth.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Authentication helpers for Alternator boto clients."""
 
 from __future__ import annotations
diff --git a/alternator/core/compression.py b/alternator/core/compression.py
index f4205d4..9c48345 100644
--- a/alternator/core/compression.py
+++ b/alternator/core/compression.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Request body compression for bandwidth optimization."""
 
 from __future__ import annotations
diff --git a/alternator/core/deterministic_rand.py b/alternator/core/deterministic_rand.py
index fba15c7..1259c21 100644
--- a/alternator/core/deterministic_rand.py
+++ b/alternator/core/deterministic_rand.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Deterministic PRNG for request-scoped node ordering.
 
 The generator uses the project's stable lagged-Fibonacci sequence so clients
diff --git a/alternator/core/handlers.py b/alternator/core/handlers.py
index 500166f..be7380c 100644
--- a/alternator/core/handlers.py
+++ b/alternator/core/handlers.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Shared event handlers for Alternator clients."""
 
 from __future__ import annotations
diff --git a/alternator/core/hashing.py b/alternator/core/hashing.py
index 7225d49..f18bce2 100644
--- a/alternator/core/hashing.py
+++ b/alternator/core/hashing.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """
 MurmurHash3 x64 128-bit implementation for cross-language compatibility.
 
diff --git a/alternator/core/headers.py b/alternator/core/headers.py
index 40b8578..d16b221 100644
--- a/alternator/core/headers.py
+++ b/alternator/core/headers.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Request header filtering for bandwidth optimization."""
 
 from __future__ import annotations
diff --git a/alternator/core/key_affinity.py b/alternator/core/key_affinity.py
index b5303fd..e90445c 100644
--- a/alternator/core/key_affinity.py
+++ b/alternator/core/key_affinity.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Key route affinity for LWT-optimized routing."""
 
 from __future__ import annotations
diff --git a/alternator/core/live_nodes.py b/alternator/core/live_nodes.py
index 74dace3..89d7db2 100644
--- a/alternator/core/live_nodes.py
+++ b/alternator/core/live_nodes.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Live nodes management and selection for Alternator load balancing."""
 
 from __future__ import annotations
diff --git a/alternator/core/query_plan.py b/alternator/core/query_plan.py
index b8bb29d..412a2e5 100644
--- a/alternator/core/query_plan.py
+++ b/alternator/core/query_plan.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Lazy query plan for request-scoped node routing."""
 
 from __future__ import annotations
diff --git a/alternator/core/request.py b/alternator/core/request.py
index 9a598dc..b98a957 100644
--- a/alternator/core/request.py
+++ b/alternator/core/request.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Request parsing utilities for Alternator client."""
 
 from __future__ import annotations
diff --git a/alternator/core/routing_scope.py b/alternator/core/routing_scope.py
index c2a241d..2260e67 100644
--- a/alternator/core/routing_scope.py
+++ b/alternator/core/routing_scope.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Routing scope classes for topology-aware request routing."""
 
 from __future__ import annotations
diff --git a/alternator/core/tls.py b/alternator/core/tls.py
index 1406a5e..09a6d07 100644
--- a/alternator/core/tls.py
+++ b/alternator/core/tls.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """TLS configuration utilities."""
 
 from __future__ import annotations
diff --git a/alternator/exceptions.py b/alternator/exceptions.py
index 4884f4a..49a6bb7 100644
--- a/alternator/exceptions.py
+++ b/alternator/exceptions.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Custom exceptions for Alternator load balancing client."""
 
 from __future__ import annotations
diff --git a/alternator/vector.py b/alternator/vector.py
index 7574e15..3034189 100644
--- a/alternator/vector.py
+++ b/alternator/vector.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Vector search support for ScyllaDB Alternator.
 
 This module provides the :class:`Vector` type and the
diff --git a/examples/async_demo.py b/examples/async_demo.py
index 7171302..a1f35d4 100644
--- a/examples/async_demo.py
+++ b/examples/async_demo.py
@@ -1,4 +1,18 @@
 #!/usr/bin/env python3
+# Copyright ScyllaDB, 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.
+
 """
 Asynchronous usage demo for Alternator load balancing client.
 
diff --git a/examples/capability_configuration.py b/examples/capability_configuration.py
index 35b3cee..31a3092 100644
--- a/examples/capability_configuration.py
+++ b/examples/capability_configuration.py
@@ -1,4 +1,18 @@
 #!/usr/bin/env python3
+# Copyright ScyllaDB, 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.
+
 """
 Configuration recipes for advanced Alternator client capabilities.
 
diff --git a/examples/compare_aws_sdk.py b/examples/compare_aws_sdk.py
index 166031d..73b548b 100644
--- a/examples/compare_aws_sdk.py
+++ b/examples/compare_aws_sdk.py
@@ -1,4 +1,18 @@
 #!/usr/bin/env python3
+# Copyright ScyllaDB, 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.
+
 """
 Compare an Alternator client with a regular AWS SDK DynamoDB client.
 
diff --git a/examples/sync_demo.py b/examples/sync_demo.py
index a45de46..6b11c67 100644
--- a/examples/sync_demo.py
+++ b/examples/sync_demo.py
@@ -1,4 +1,18 @@
 #!/usr/bin/env python3
+# Copyright ScyllaDB, 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.
+
 """
 Basic synchronous usage demo for Alternator load balancing client.
 
diff --git a/pyproject.toml b/pyproject.toml
index 203522f..a0b4b0b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ dev = [
     "pytest-timeout>=2.0",
     "hypothesis>=6.0",
     "mypy>=1.0",
-    "ruff>=0.1.0",
+    "ruff>=0.16.0",
     "types-aiobotocore[dynamodb]>=2.5.0",
     "boto3-stubs[dynamodb]>=1.28.0",
 ]
@@ -98,6 +98,7 @@ select = [
     "I",    # isort
     "B",    # flake8-bugbear
     "C4",   # flake8-comprehensions
+    "CPY",  # flake8-copyright
     "UP",   # pyupgrade
     "ARG",  # flake8-unused-arguments
     "SIM",  # flake8-simplify
@@ -117,6 +118,9 @@ ignore = [
 [tool.ruff.lint.isort]
 known-first-party = ["alternator"]
 
+[tool.ruff.lint.flake8-copyright]
+notice-rgx = "(?i)Copyright ScyllaDB, Inc\\."
+
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 asyncio_mode = "auto"
diff --git a/tests/__init__.py b/tests/__init__.py
index 31562e1..9e49932 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +1,15 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for alternator package."""
diff --git a/tests/conftest.py b/tests/conftest.py
index cbee961..44d78f4 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Shared pytest fixtures and configuration."""
 
 from __future__ import annotations
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
index 3f81139..c4c0101 100644
--- a/tests/integration/__init__.py
+++ b/tests/integration/__init__.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for alternator package."""
 
 import os
diff --git a/tests/integration/scylla_version.py b/tests/integration/scylla_version.py
index 0a6c4c1..a01763c 100644
--- a/tests/integration/scylla_version.py
+++ b/tests/integration/scylla_version.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """ScyllaDB version detection for integration tests.
 
 This module provides utilities to detect the running ScyllaDB version
diff --git a/tests/integration/test_async_client.py b/tests/integration/test_async_client.py
index a807fc3..e16bd7a 100644
--- a/tests/integration/test_async_client.py
+++ b/tests/integration/test_async_client.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for asynchronous client.
 
 These tests require a running Scylla cluster with Alternator enabled.
diff --git a/tests/integration/test_batch_transactions.py b/tests/integration/test_batch_transactions.py
index d94cc84..87f8056 100644
--- a/tests/integration/test_batch_transactions.py
+++ b/tests/integration/test_batch_transactions.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for batch operations.
 
 These tests require a running Scylla cluster with Alternator enabled.
diff --git a/tests/integration/test_composite_keys.py b/tests/integration/test_composite_keys.py
index 247b76d..26f6ec5 100644
--- a/tests/integration/test_composite_keys.py
+++ b/tests/integration/test_composite_keys.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for tables with composite keys (HASH + RANGE).
 
 These tests require a running Scylla cluster with Alternator enabled.
diff --git a/tests/integration/test_connection_reuse.py b/tests/integration/test_connection_reuse.py
index 3578588..1cf348b 100644
--- a/tests/integration/test_connection_reuse.py
+++ b/tests/integration/test_connection_reuse.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for HTTP/HTTPS connection reuse and pooling.
 
 These tests verify that the client properly reuses TCP connections for both
diff --git a/tests/integration/test_header_optimization.py b/tests/integration/test_header_optimization.py
index 7b2552d..7c87384 100644
--- a/tests/integration/test_header_optimization.py
+++ b/tests/integration/test_header_optimization.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for prepared-request header filtering."""
 
 from __future__ import annotations
diff --git a/tests/integration/test_key_affinity_operations.py b/tests/integration/test_key_affinity_operations.py
index 21a5498..36b36a2 100644
--- a/tests/integration/test_key_affinity_operations.py
+++ b/tests/integration/test_key_affinity_operations.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for per-operation-type key affinity routing.
 
 Tests verify that key affinity works correctly for each DynamoDB operation type
diff --git a/tests/integration/test_live_nodes.py b/tests/integration/test_live_nodes.py
index 46c60d8..71979b6 100644
--- a/tests/integration/test_live_nodes.py
+++ b/tests/integration/test_live_nodes.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for live-node discovery through public helpers."""
 
 from __future__ import annotations
diff --git a/tests/integration/test_node_health.py b/tests/integration/test_node_health.py
index 4d1a59a..75b46e7 100644
--- a/tests/integration/test_node_health.py
+++ b/tests/integration/test_node_health.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for node health tracking behavior.
 
 Tests verify node discovery, node list refresh, and behavior when nodes
diff --git a/tests/integration/test_request_compression.py b/tests/integration/test_request_compression.py
index 89ce879..f83a144 100644
--- a/tests/integration/test_request_compression.py
+++ b/tests/integration/test_request_compression.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for request compression on prepared requests."""
 
 from __future__ import annotations
diff --git a/tests/integration/test_response_compression.py b/tests/integration/test_response_compression.py
index e2e7938..a994c42 100644
--- a/tests/integration/test_response_compression.py
+++ b/tests/integration/test_response_compression.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for HTTP response compression."""
 
 from __future__ import annotations
diff --git a/tests/integration/test_sdk_config.py b/tests/integration/test_sdk_config.py
index 36be532..17aa6fb 100644
--- a/tests/integration/test_sdk_config.py
+++ b/tests/integration/test_sdk_config.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for SDK client configuration propagation."""
 
 from __future__ import annotations
diff --git a/tests/integration/test_sync_client.py b/tests/integration/test_sync_client.py
index 4f4bf01..456a995 100644
--- a/tests/integration/test_sync_client.py
+++ b/tests/integration/test_sync_client.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for synchronous client.
 
 These tests require a running Scylla cluster with Alternator enabled.
diff --git a/tests/integration/test_tls.py b/tests/integration/test_tls.py
index 4a72e13..992de47 100644
--- a/tests/integration/test_tls.py
+++ b/tests/integration/test_tls.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for TLS configuration.
 
 Tests TLS session caching for both ALN (node discovery) and DynamoDB API requests,
diff --git a/tests/integration/test_vector.py b/tests/integration/test_vector.py
index 4589130..63ff708 100644
--- a/tests/integration/test_vector.py
+++ b/tests/integration/test_vector.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for vector search support.
 
 These tests require a running ScyllaDB cluster with Alternator and vector
diff --git a/tests/integration/test_wrong_dc_rack.py b/tests/integration/test_wrong_dc_rack.py
index 9681eff..d57e062 100644
--- a/tests/integration/test_wrong_dc_rack.py
+++ b/tests/integration/test_wrong_dc_rack.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Integration tests for wrong DC/rack error handling and fallback.
 
 These tests verify that the client gracefully handles incorrect datacenter
diff --git a/tests/integration/wire_capture.py b/tests/integration/wire_capture.py
index 88f3d7a..3f2dac1 100644
--- a/tests/integration/wire_capture.py
+++ b/tests/integration/wire_capture.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Helpers for inspecting botocore requests immediately before transport send."""
 
 from __future__ import annotations
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
index e69de29..6566043 100644
--- a/tests/unit/__init__.py
+++ b/tests/unit/__init__.py
@@ -0,0 +1,13 @@
+# Copyright ScyllaDB, 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.
diff --git a/tests/unit/test_async_manager.py b/tests/unit/test_async_manager.py
index 80bb1fa..7520b14 100644
--- a/tests/unit/test_async_manager.py
+++ b/tests/unit/test_async_manager.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for AsyncLiveNodesManager and AsyncPartitionKeyCache."""
 
 import asyncio
diff --git a/tests/unit/test_auth.py b/tests/unit/test_auth.py
index 370da5e..4f285d1 100644
--- a/tests/unit/test_auth.py
+++ b/tests/unit/test_auth.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for explicit Alternator auth configuration."""
 
 import pytest
diff --git a/tests/unit/test_boto_config.py b/tests/unit/test_boto_config.py
index 769f0b0..71c8eb0 100644
--- a/tests/unit/test_boto_config.py
+++ b/tests/unit/test_boto_config.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for internal BotoConfig creation."""
 
 import contextlib
diff --git a/tests/unit/test_client_alias.py b/tests/unit/test_client_alias.py
index f116a08..cf81632 100644
--- a/tests/unit/test_client_alias.py
+++ b/tests/unit/test_client_alias.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for top-level client convenience alias."""
 
 import pytest
diff --git a/tests/unit/test_compression.py b/tests/unit/test_compression.py
index 189da47..09e55c4 100644
--- a/tests/unit/test_compression.py
+++ b/tests/unit/test_compression.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for request body compression."""
 
 import gzip
diff --git a/tests/unit/test_config.py b/tests/unit/test_config.py
index d0d736f..fc98a96 100644
--- a/tests/unit/test_config.py
+++ b/tests/unit/test_config.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for configuration classes."""
 
 from pathlib import Path
diff --git a/tests/unit/test_deterministic_rand.py b/tests/unit/test_deterministic_rand.py
index fd4cce3..addd1cf 100644
--- a/tests/unit/test_deterministic_rand.py
+++ b/tests/unit/test_deterministic_rand.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for deterministic query-plan PRNG."""
 
 from __future__ import annotations
diff --git a/tests/unit/test_fake_alternator_server.py b/tests/unit/test_fake_alternator_server.py
index 53899d2..085507d 100644
--- a/tests/unit/test_fake_alternator_server.py
+++ b/tests/unit/test_fake_alternator_server.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for the fake Alternator HTTP server fixture."""
 
 from alternator._http import create_sync_http_fetcher
diff --git a/tests/unit/test_hashing.py b/tests/unit/test_hashing.py
index a9dd27b..0329fd2 100644
--- a/tests/unit/test_hashing.py
+++ b/tests/unit/test_hashing.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for MurmurHash3 implementation and hash vectors."""
 
 import pytest
diff --git a/tests/unit/test_hashing_properties.py b/tests/unit/test_hashing_properties.py
index b325935..eb8f7fc 100644
--- a/tests/unit/test_hashing_properties.py
+++ b/tests/unit/test_hashing_properties.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Property-based tests for hash distribution verification."""
 
 from hypothesis import given, settings
diff --git a/tests/unit/test_headers.py b/tests/unit/test_headers.py
index d7bfff7..6101d54 100644
--- a/tests/unit/test_headers.py
+++ b/tests/unit/test_headers.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for header filtering functionality."""
 
 from collections.abc import Callable
diff --git a/tests/unit/test_helper.py b/tests/unit/test_helper.py
index cbe0830..2caf0bb 100644
--- a/tests/unit/test_helper.py
+++ b/tests/unit/test_helper.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for public Helper facades."""
 
 from __future__ import annotations
diff --git a/tests/unit/test_http.py b/tests/unit/test_http.py
index 3cd4083..c53e285 100644
--- a/tests/unit/test_http.py
+++ b/tests/unit/test_http.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for HTTP fetcher and SSL context creation."""
 
 import json
diff --git a/tests/unit/test_key_affinity.py b/tests/unit/test_key_affinity.py
index ab1bf48..fff9376 100644
--- a/tests/unit/test_key_affinity.py
+++ b/tests/unit/test_key_affinity.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for key route affinity module."""
 
 import contextlib
diff --git a/tests/unit/test_live_nodes.py b/tests/unit/test_live_nodes.py
index 15318f7..e6460af 100644
--- a/tests/unit/test_live_nodes.py
+++ b/tests/unit/test_live_nodes.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for live nodes management and selection."""
 
 import threading
diff --git a/tests/unit/test_network_failures.py b/tests/unit/test_network_failures.py
index 1260115..89db198 100644
--- a/tests/unit/test_network_failures.py
+++ b/tests/unit/test_network_failures.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for network failure scenarios."""
 
 from __future__ import annotations
diff --git a/tests/unit/test_query_plan.py b/tests/unit/test_query_plan.py
index fed0beb..bd1fb95 100644
--- a/tests/unit/test_query_plan.py
+++ b/tests/unit/test_query_plan.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for LazyQueryPlan class."""
 
 from collections import Counter
diff --git a/tests/unit/test_request.py b/tests/unit/test_request.py
index 61879ec..3a6facd 100644
--- a/tests/unit/test_request.py
+++ b/tests/unit/test_request.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for request parsing utilities."""
 
 import json
diff --git a/tests/unit/test_request_lifecycle.py b/tests/unit/test_request_lifecycle.py
index ba286dd..2cb512f 100644
--- a/tests/unit/test_request_lifecycle.py
+++ b/tests/unit/test_request_lifecycle.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for Alternator request mutation timing."""
 
 from __future__ import annotations
diff --git a/tests/unit/test_response_compression.py b/tests/unit/test_response_compression.py
index 670d1fc..9962af8 100644
--- a/tests/unit/test_response_compression.py
+++ b/tests/unit/test_response_compression.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for HTTP response compression handlers."""
 
 from __future__ import annotations
diff --git a/tests/unit/test_routing_scope.py b/tests/unit/test_routing_scope.py
index 92d90b5..e7032dc 100644
--- a/tests/unit/test_routing_scope.py
+++ b/tests/unit/test_routing_scope.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for routing scope classes."""
 
 from alternator.core.routing_scope import (
diff --git a/tests/unit/test_scylla_version.py b/tests/unit/test_scylla_version.py
index 51b2f82..0562bc8 100644
--- a/tests/unit/test_scylla_version.py
+++ b/tests/unit/test_scylla_version.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Unit tests for ScyllaDB version detection."""
 
 import os
diff --git a/tests/unit/test_sync_manager.py b/tests/unit/test_sync_manager.py
index e77f93a..209583e 100644
--- a/tests/unit/test_sync_manager.py
+++ b/tests/unit/test_sync_manager.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for SyncLiveNodesManager."""
 
 import time
diff --git a/tests/unit/test_tls.py b/tests/unit/test_tls.py
index 8733f96..cfa9db4 100644
--- a/tests/unit/test_tls.py
+++ b/tests/unit/test_tls.py
@@ -1,3 +1,17 @@
+# Copyright ScyllaDB, 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.
+
 """Tests for TLS configuration utilities."""
 
 import ssl