Copyright protection and traditional inheritance.
1. Feng Chuanqiang owns copyrights or patents related to Wing Chun. You do not want others to use or distribute the technology without authorization.
2. Wing Chun is a traditional martial arts form that needs to be passed down through oral and heart teaching. Feng Chuanqiang hopes to pass on Wing Chun skills to students or designated successors, rather than publicly displaying them to the public.