Sir,
I know about pakistan's contribution to JF-17 program which has its roots partly in Mig 33 and Super 7 programs , but still is a license manufactured Chinese aircraft of Chengdu State Aircraft Factory No.132 Aircraft Plant.
How can pakistan sell a Chinese aircraft unless it has patents for all the subsystems required for production of the aircraft.
Pakistan will require clearence from china for airframe/avionics/ flight control system/ radar/ FBW suite/Armaments/Ejection seat and license from russia for engine and propulsion system.
You cannot claim to sell the aircraft because you designed DSI and made modifications to chinese designs.. it still remains a chinese aircraft made in joint venture with pakistan as a user and licensee.
If you can acquire a license for complete offset of production of all subsytems from china and russia and buy the IP rights, maybe then you might be ina position to export after you finish your own military's demand.
Unless you have source to provide the above information, please dont be offended by humorous rhetoric, I have seen 5000 such replies on LCA