/usr/lib/python3/dist-packages/opcua/server/ is in python3-opcua 0.90.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/opcua/server/__init__.py
/usr/lib/python3/dist-packages/opcua/server/address_space.py
/usr/lib/python3/dist-packages/opcua/server/binary_server_asyncio.py
/usr/lib/python3/dist-packages/opcua/server/event_generator.py
/usr/lib/python3/dist-packages/opcua/server/history.py
/usr/lib/python3/dist-packages/opcua/server/history_sql.py
/usr/lib/python3/dist-packages/opcua/server/internal_server.py
/usr/lib/python3/dist-packages/opcua/server/internal_subscription.py
/usr/lib/python3/dist-packages/opcua/server/server.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/__init__.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part10.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part11.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part13.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part3.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part4.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part5.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part8.py
/usr/lib/python3/dist-packages/opcua/server/standard_address_space/standard_address_space_part9.py
/usr/lib/python3/dist-packages/opcua/server/subscription_service.py
/usr/lib/python3/dist-packages/opcua/server/uaprocessor.py
/usr/lib/python3/dist-packages/opcua/server/users.py