diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..261eeb9
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
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+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+       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.
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+   limitations under the License.
diff --git a/diag_master/src/diag_master/__init__.py b/diag_master/src/diag_master/__init__.py
index 8454e85..4c34071 100644
--- a/diag_master/src/diag_master/__init__.py
+++ b/diag_master/src/diag_master/__init__.py
@@ -1 +1,15 @@
+# Copyright 2025 TIER IV, 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.
+
 """Diagnostic master that aggregates updates from workers, provides a web UI, and publishes ROS 2 diagnostics."""
diff --git a/diag_master/src/diag_master/echarts_adapter.py b/diag_master/src/diag_master/echarts_adapter.py
index 51852c7..b8bafc4 100644
--- a/diag_master/src/diag_master/echarts_adapter.py
+++ b/diag_master/src/diag_master/echarts_adapter.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Adapter for converting sync graph to ECharts visualization format."""
 
 from typing import Any
diff --git a/diag_master/src/diag_master/examples/__init__.py b/diag_master/src/diag_master/examples/__init__.py
index e69de29..3da446d 100644
--- a/diag_master/src/diag_master/examples/__init__.py
+++ b/diag_master/src/diag_master/examples/__init__.py
@@ -0,0 +1,14 @@
+# Copyright 2025 TIER IV, 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/diag_master/src/diag_master/examples/example_graph.py b/diag_master/src/diag_master/examples/example_graph.py
index eba41a4..4fa45a1 100644
--- a/diag_master/src/diag_master/examples/example_graph.py
+++ b/diag_master/src/diag_master/examples/example_graph.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 from pathlib import Path
 
 import yaml
diff --git a/diag_master/src/diag_master/main.py b/diag_master/src/diag_master/main.py
index a8ff23d..5594b02 100644
--- a/diag_master/src/diag_master/main.py
+++ b/diag_master/src/diag_master/main.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Diagnostic master entry point and main class."""
 
 import signal
diff --git a/diag_master/src/diag_master/ros2_diagnostics_adapter.py b/diag_master/src/diag_master/ros2_diagnostics_adapter.py
index 4c2546d..54f74b1 100644
--- a/diag_master/src/diag_master/ros2_diagnostics_adapter.py
+++ b/diag_master/src/diag_master/ros2_diagnostics_adapter.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Adapter for publishing sync graph diagnostics as ROS 2 diagnostic messages."""
 
 import networkx as nx
diff --git a/diag_master/src/diag_master/web_ui.py b/diag_master/src/diag_master/web_ui.py
index 15135de..04b0e08 100644
--- a/diag_master/src/diag_master/web_ui.py
+++ b/diag_master/src/diag_master/web_ui.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Flask-based web UI for visualizing the sync graph."""
 
 from threading import Thread
diff --git a/diag_worker/src/diag_worker/__init__.py b/diag_worker/src/diag_worker/__init__.py
index 84aa7ef..849fed4 100644
--- a/diag_worker/src/diag_worker/__init__.py
+++ b/diag_worker/src/diag_worker/__init__.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Diagnostic worker for monitoring local PTP services and sending updates to the diagnostic master."""
 
 from . import main
diff --git a/diag_worker/src/diag_worker/main.py b/diag_worker/src/diag_worker/main.py
index 692d69d..60256b4 100644
--- a/diag_worker/src/diag_worker/main.py
+++ b/diag_worker/src/diag_worker/main.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Diagnostic worker entry point."""
 
 import asyncio
diff --git a/diag_worker/src/diag_worker/monitor_task.py b/diag_worker/src/diag_worker/monitor_task.py
index 0dd1c87..616e813 100644
--- a/diag_worker/src/diag_worker/monitor_task.py
+++ b/diag_worker/src/diag_worker/monitor_task.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Abstract base class for monitor tasks."""
 
 import asyncio
diff --git a/diag_worker/src/diag_worker/phc2sys_monitor_task.py b/diag_worker/src/diag_worker/phc2sys_monitor_task.py
index 5a9f067..92546fe 100644
--- a/diag_worker/src/diag_worker/phc2sys_monitor_task.py
+++ b/diag_worker/src/diag_worker/phc2sys_monitor_task.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Monitor task for phc2sys systemd units."""
 
 from journal_monitor.console_polling_journal_monitor import ConsolePollingJournalMonitor
diff --git a/diag_worker/src/diag_worker/ptp4l_monitor_task.py b/diag_worker/src/diag_worker/ptp4l_monitor_task.py
index b520a34..f3396ed 100644
--- a/diag_worker/src/diag_worker/ptp4l_monitor_task.py
+++ b/diag_worker/src/diag_worker/ptp4l_monitor_task.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Monitor task for ptp4l systemd units."""
 
 from journal_monitor.console_polling_journal_monitor import ConsolePollingJournalMonitor
diff --git a/diag_worker/src/diag_worker/systemd_util.py b/diag_worker/src/diag_worker/systemd_util.py
index f1cfb40..a0da627 100644
--- a/diag_worker/src/diag_worker/systemd_util.py
+++ b/diag_worker/src/diag_worker/systemd_util.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Utilities for interacting with systemd units."""
 
 import re
diff --git a/journal_monitor/src/journal_monitor/__init__.py b/journal_monitor/src/journal_monitor/__init__.py
index 119c5af..2471cc3 100644
--- a/journal_monitor/src/journal_monitor/__init__.py
+++ b/journal_monitor/src/journal_monitor/__init__.py
@@ -1 +1,15 @@
+# Copyright 2025 TIER IV, 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.
+
 """Journal monitoring utilities for reading systemd journal entries."""
diff --git a/journal_monitor/src/journal_monitor/console_polling_journal_monitor.py b/journal_monitor/src/journal_monitor/console_polling_journal_monitor.py
index bef4409..5ce601b 100644
--- a/journal_monitor/src/journal_monitor/console_polling_journal_monitor.py
+++ b/journal_monitor/src/journal_monitor/console_polling_journal_monitor.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Journal monitor implementation using journalctl subprocess."""
 
 import json
diff --git a/journal_monitor/src/journal_monitor/journal_monitor.py b/journal_monitor/src/journal_monitor/journal_monitor.py
index 1318811..8aa43d9 100644
--- a/journal_monitor/src/journal_monitor/journal_monitor.py
+++ b/journal_monitor/src/journal_monitor/journal_monitor.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Abstract journal monitor interface and data types."""
 
 from abc import ABC, abstractmethod
diff --git a/linuxptp_monitor/src/linuxptp_monitor/__init__.py b/linuxptp_monitor/src/linuxptp_monitor/__init__.py
index 4e1eb2f..b6f55f7 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/__init__.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/__init__.py
@@ -1 +1,15 @@
+# Copyright 2025 TIER IV, 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.
+
 """Monitoring utilities for LinuxPTP programs ptp4l and phc2sys."""
diff --git a/linuxptp_monitor/src/linuxptp_monitor/ethtool_harness.py b/linuxptp_monitor/src/linuxptp_monitor/ethtool_harness.py
index 3246d25..5307b9a 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/ethtool_harness.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/ethtool_harness.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Ethtool integration for clock device discovery."""
 
 import re
diff --git a/linuxptp_monitor/src/linuxptp_monitor/linuxptp_config.py b/linuxptp_monitor/src/linuxptp_monitor/linuxptp_config.py
index 69362bb..63bc86d 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/linuxptp_config.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/linuxptp_config.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Adapter for LinuxPTP configuration parsing."""
 
 import argparse
diff --git a/linuxptp_monitor/src/linuxptp_monitor/phc2sys_instance.py b/linuxptp_monitor/src/linuxptp_monitor/phc2sys_instance.py
index 4e7e1f8..47b0939 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/phc2sys_instance.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/phc2sys_instance.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """PHC2SYS configuration and state parsing."""
 
 import re
diff --git a/linuxptp_monitor/src/linuxptp_monitor/ptp4l_instance.py b/linuxptp_monitor/src/linuxptp_monitor/ptp4l_instance.py
index 4a49537..093eedc 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/ptp4l_instance.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/ptp4l_instance.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """PTP4L configuration and state parsing."""
 
 import re
diff --git a/linuxptp_monitor/src/linuxptp_monitor/state_machine.py b/linuxptp_monitor/src/linuxptp_monitor/state_machine.py
index 05c9978..d1a8f21 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/state_machine.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/state_machine.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """State machine for parsing systemd unit journal entries."""
 
 import re
diff --git a/linuxptp_monitor/src/linuxptp_monitor/util.py b/linuxptp_monitor/src/linuxptp_monitor/util.py
index 5224886..65d1c53 100644
--- a/linuxptp_monitor/src/linuxptp_monitor/util.py
+++ b/linuxptp_monitor/src/linuxptp_monitor/util.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Utility functions for LinuxPTP monitoring."""
 
 import re
diff --git a/pmc_monitor/src/pmc_monitor/__init__.py b/pmc_monitor/src/pmc_monitor/__init__.py
index 52fd4aa..128e85d 100644
--- a/pmc_monitor/src/pmc_monitor/__init__.py
+++ b/pmc_monitor/src/pmc_monitor/__init__.py
@@ -1 +1,15 @@
+# Copyright 2025 TIER IV, 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.
+
 """Library for querying PTP instance (≈ clock) state via the PTP Management Protocol."""
diff --git a/pmc_monitor/src/pmc_monitor/pmc_monitor.py b/pmc_monitor/src/pmc_monitor/pmc_monitor.py
index 03e9869..0b23070 100644
--- a/pmc_monitor/src/pmc_monitor/pmc_monitor.py
+++ b/pmc_monitor/src/pmc_monitor/pmc_monitor.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """PTP Management Protocol (PMC) client for monitoring PTP instances."""
 
 import asyncio
diff --git a/pmc_monitor/src/pmc_monitor/pmc_parser.py b/pmc_monitor/src/pmc_monitor/pmc_parser.py
index 80a0a2f..911b0d8 100644
--- a/pmc_monitor/src/pmc_monitor/pmc_parser.py
+++ b/pmc_monitor/src/pmc_monitor/pmc_parser.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Parser for PMC (PTP Management Client) text output."""
 
 import builtins
diff --git a/pmc_monitor/src/pmc_monitor/pmc_protocol.py b/pmc_monitor/src/pmc_monitor/pmc_protocol.py
index 7659440..193e839 100644
--- a/pmc_monitor/src/pmc_monitor/pmc_protocol.py
+++ b/pmc_monitor/src/pmc_monitor/pmc_protocol.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """PMC (PTP Management Client) protocol dataclasses for parsing PTP management messages.
 
 This module defines dataclasses that correspond to PTP management TLV (Type-Length-Value) types.
diff --git a/pmc_monitor/src/pmc_monitor/ptp_instance.py b/pmc_monitor/src/pmc_monitor/ptp_instance.py
index 206a84c..f3211cf 100644
--- a/pmc_monitor/src/pmc_monitor/ptp_instance.py
+++ b/pmc_monitor/src/pmc_monitor/ptp_instance.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """PTP instance and port state classes."""
 
 from dataclasses import dataclass, field
diff --git a/pmc_monitor/tests/pmc_parser_test.py b/pmc_monitor/tests/pmc_parser_test.py
index 68d19e6..f2efa75 100644
--- a/pmc_monitor/tests/pmc_parser_test.py
+++ b/pmc_monitor/tests/pmc_parser_test.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 from pathlib import Path
 
 from pmc_monitor.pmc_protocol import ManagementTlv, Request, Response
diff --git a/ros2_transport/src/ros2_transport/__init__.py b/ros2_transport/src/ros2_transport/__init__.py
index 0aea739..c84e5ef 100644
--- a/ros2_transport/src/ros2_transport/__init__.py
+++ b/ros2_transport/src/ros2_transport/__init__.py
@@ -1 +1,15 @@
+# Copyright 2025 TIER IV, 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.
+
 """ROS 2 pub/sub transport for graph update messages."""
diff --git a/ros2_transport/src/ros2_transport/client.py b/ros2_transport/src/ros2_transport/client.py
index 295f552..f651f34 100644
--- a/ros2_transport/src/ros2_transport/client.py
+++ b/ros2_transport/src/ros2_transport/client.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Client (ROS 2 publisher) for graph updates."""
 
 from rclpy.node import Node
diff --git a/ros2_transport/src/ros2_transport/server.py b/ros2_transport/src/ros2_transport/server.py
index da9a4b5..58e1523 100644
--- a/ros2_transport/src/ros2_transport/server.py
+++ b/ros2_transport/src/ros2_transport/server.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Server (ROS 2 subscriber) for graph updates."""
 
 from typing import Callable
diff --git a/ros2_transport/tests/test_client_server.py b/ros2_transport/tests/test_client_server.py
index ddc60a1..a2d12e5 100644
--- a/ros2_transport/tests/test_client_server.py
+++ b/ros2_transport/tests/test_client_server.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 import rclpy
 from rclpy.task import Future
 from ros2_transport.client import Ros2Client
diff --git a/scripts/cloudflare_pages_build.sh b/scripts/cloudflare_pages_build.sh
index f0111e3..9b69127 100755
--- a/scripts/cloudflare_pages_build.sh
+++ b/scripts/cloudflare_pages_build.sh
@@ -1,5 +1,19 @@
 #!/usr/bin/env bash
 
+# Copyright 2025 TIER IV, 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.
+
 set -e
 
 apt download graphviz libgvc6
diff --git a/scripts/mkdocs_macros.py b/scripts/mkdocs_macros.py
index fc1a647..d1f441f 100644
--- a/scripts/mkdocs_macros.py
+++ b/scripts/mkdocs_macros.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 import importlib
 import json
 from typing import TYPE_CHECKING
diff --git a/sync_graph/src/sync_graph/__init__.py b/sync_graph/src/sync_graph/__init__.py
index 74f7265..be277d2 100644
--- a/sync_graph/src/sync_graph/__init__.py
+++ b/sync_graph/src/sync_graph/__init__.py
@@ -1 +1,15 @@
+# Copyright 2025 TIER IV, 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.
+
 """A library for modeling clock synchronization graphs and performing diagnostics."""
diff --git a/sync_graph/src/sync_graph/sync_graph.py b/sync_graph/src/sync_graph/sync_graph.py
index e5f66ef..0122940 100644
--- a/sync_graph/src/sync_graph/sync_graph.py
+++ b/sync_graph/src/sync_graph/sync_graph.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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 sync graph implementation for clock synchronization modeling."""
 
 from collections import defaultdict
diff --git a/sync_graph/src/sync_graph/timed_graph_update_queue.py b/sync_graph/src/sync_graph/timed_graph_update_queue.py
index 3538f78..9c7092c 100644
--- a/sync_graph/src/sync_graph/timed_graph_update_queue.py
+++ b/sync_graph/src/sync_graph/timed_graph_update_queue.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Queue of graph updates with automatic expiration based on age."""
 
 import time
diff --git a/sync_graph/src/sync_graph/update_aggregator.py b/sync_graph/src/sync_graph/update_aggregator.py
index 111921c..612743e 100644
--- a/sync_graph/src/sync_graph/update_aggregator.py
+++ b/sync_graph/src/sync_graph/update_aggregator.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """Aggregate possibly noisy or high-frequency updates.
 
 Some update types might be high-frequency, or might be noisy.
diff --git a/sync_graph/src/sync_graph/yaml.py b/sync_graph/src/sync_graph/yaml.py
index cf83cf0..b592eff 100644
--- a/sync_graph/src/sync_graph/yaml.py
+++ b/sync_graph/src/sync_graph/yaml.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 """YAML configuration parsing for sync graph setup."""
 
 from typing import Any, Literal
diff --git a/sync_graph/tests/__init__.py b/sync_graph/tests/__init__.py
index e69de29..906f873 100644
--- a/sync_graph/tests/__init__.py
+++ b/sync_graph/tests/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2025 TIER IV, 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/sync_graph/tests/conftest.py b/sync_graph/tests/conftest.py
index e669680..7d0793c 100644
--- a/sync_graph/tests/conftest.py
+++ b/sync_graph/tests/conftest.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 from typing import Literal
 
 import pytest
diff --git a/sync_graph/tests/test_clock_diagnostics.py b/sync_graph/tests/test_clock_diagnostics.py
index cfbbeea..0c9cccd 100644
--- a/sync_graph/tests/test_clock_diagnostics.py
+++ b/sync_graph/tests/test_clock_diagnostics.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 import pytest
 from sync_tooling_msgs.clock_master_update_pb2 import ClockMasterUpdate
 from sync_tooling_msgs.port_state_pb2 import PortState
diff --git a/sync_graph/tests/test_graph_consistency.py b/sync_graph/tests/test_graph_consistency.py
index 024e508..8b253e0 100644
--- a/sync_graph/tests/test_graph_consistency.py
+++ b/sync_graph/tests/test_graph_consistency.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 from typing import TYPE_CHECKING
 
 import pytest
diff --git a/sync_graph/tests/test_link_diagnostics.py b/sync_graph/tests/test_link_diagnostics.py
index 1435eb6..c78fb05 100644
--- a/sync_graph/tests/test_link_diagnostics.py
+++ b/sync_graph/tests/test_link_diagnostics.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 import pytest
 
 from .util import (
diff --git a/sync_graph/tests/test_reference_diagnostics.py b/sync_graph/tests/test_reference_diagnostics.py
index 8a4494f..c8b81ce 100644
--- a/sync_graph/tests/test_reference_diagnostics.py
+++ b/sync_graph/tests/test_reference_diagnostics.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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 [diagnose_reference_adherence][sync_graph.sync_graph.SyncGraph.diagnose_reference_adherence]
 family of methods.
 """
diff --git a/sync_graph/tests/test_timed_graph_update_queue.py b/sync_graph/tests/test_timed_graph_update_queue.py
index 74a8a3a..66f374d 100644
--- a/sync_graph/tests/test_timed_graph_update_queue.py
+++ b/sync_graph/tests/test_timed_graph_update_queue.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 import time
 from datetime import timedelta
 
diff --git a/sync_graph/tests/test_update_aggregator.py b/sync_graph/tests/test_update_aggregator.py
index 834c6cb..bc985ec 100644
--- a/sync_graph/tests/test_update_aggregator.py
+++ b/sync_graph/tests/test_update_aggregator.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 #!/usr/bin/env python3
 """Simple test script for the measurement aggregator function."""
 
diff --git a/sync_graph/tests/util.py b/sync_graph/tests/util.py
index 7f1f78c..4913b1d 100644
--- a/sync_graph/tests/util.py
+++ b/sync_graph/tests/util.py
@@ -1,3 +1,17 @@
+# Copyright 2025 TIER IV, 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.
+
 from networkx import DiGraph
 from sync_graph.sync_graph import Config, SyncGraph
 from sync_tooling_msgs.clock_alias_update_pb2 import ClockAliasUpdate
diff --git a/sync_tooling_msgs b/sync_tooling_msgs
index 8c6e906..b24cf2a 160000
--- a/sync_tooling_msgs
+++ b/sync_tooling_msgs
@@ -1 +1 @@
-Subproject commit 8c6e9064f380d23621dbf19b6d8ca94e65faccce
+Subproject commit b24cf2ac44ebe85a6934328d34d7d8f3bf58e2fc