What does "completely independent intellectual property rights" mean for domestic large aircraft C9 19?

This means that the c9 19 aircraft itself is completely designed by itself, from the fuselage to the engine, control system and other internal components. The key components in the internal components, such as the engine, are purchased from foreign companies, but they also need to be improved according to the needs of the aircraft.

Let's give a simpler example. After careful comparison and research, after considering the performance and actual needs, I made a list of all the parts of a computer, and then I saved a computer. I made a case myself, and I made a slot in it. Other cpu, memory and other parts are bought by brands such as Intel and Kingston. I have "completely independent intellectual property rights" for this computer. Of course, this metaphor is not appropriate, because designing an airplane is very complicated and there are quite a few technical problems to consider. Therefore, although the core components are all purchased from foreign companies, it is no small achievement for China Aircraft Industry to design a commercial single-aisle aircraft. Exaggerating "independent intellectual property rights" is a bit boastful, but there is no need to sell yourself short. China's industry is going through the most difficult process from quantitative change to qualitative change, with a long way to go. The independent design of C9 19 is only a starting point.