/usr/include/tao/DiffServPolicy/ is in libtao-dev 6.0.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/tao/DiffServPolicy/Client_Network_Priority_Policy.h
/usr/include/tao/DiffServPolicy/DiffServPolicy.h
/usr/include/tao/DiffServPolicy/DiffServPolicyA.h
/usr/include/tao/DiffServPolicy/DiffServPolicyC.h
/usr/include/tao/DiffServPolicy/DiffServPolicyS.h
/usr/include/tao/DiffServPolicy/DiffServPolicy_Export.h
/usr/include/tao/DiffServPolicy/DiffServPolicy_Factory.h
/usr/include/tao/DiffServPolicy/DiffServPolicy_ORBInitializer.h
/usr/include/tao/DiffServPolicy/DiffServ_Network_Priority_Hook.h
/usr/include/tao/DiffServPolicy/DiffServ_Protocols_Hooks.h
/usr/include/tao/DiffServPolicy/DiffServ_Service_Context_Handler.h
/usr/include/tao/DiffServPolicy/Server_Network_Priority_Policy.h