The Chinese blatantly copied stuff from the 60s to the late 90s. But the J-10, J-20 etc are not copies.
The J-11B, J-16 and J-15 are obviouly copies, but airframe design is not protected under IPR. Basically external shapes and software are not protected under IPR. Which is why even our Akash missile isn't a copy of the SA-6.
Do you know the Coordinating Committee for Multilateral Export Controls?
Since 1950, the arms embargo on 30 socialist countries has made China almost inaccessible to Western technology. Since 1960, China's relations with the Soviet Union have deteriorated, and China has not been able to access Soviet technology. China can only rely on itself , India can get any technology he wants from countries in the world,
When China was just founded, it was poor and white, and the East and the West blocked China at the same time. We could only rely on ourselves. Technology can be bought, copied, and stolen, but there is one thing you can't buy, and that is dignity.
The dignity of an ancient nation that has endured 100 years of suffering to stand up again,
When China developed nuclear submarines, the only reference material was a blurred photo of the USS Nautilus submarine in an American magazine.
In 1988, China spent half of the Air Force's research and development funds to ask the United States to improve the J8II. As a result, in 1989, the United States abolished all cooperative projects, and the Chinese were kicked out of the American Grumman Company that night.,Until now, that J8 has been displayed in the museum as a trophy by the United States
In 1995, China developed the J10 and asked Dassault to sell the landing gear technology. France offered $500 million. China felt that the price was too high and asked for a price reduction. The French representative said on the spot, you can refuse the deal, but wait until you find us again. , the price would be four times what it is today
Now, people laugh at China for only copying and envy that China can manufacture J20, but the efforts and tears experienced by the growth of China's aviation industry, only the Chinese themselves know,
The opinions of others are not important. A world-leading Chinese Air Force and a well-developed Chinese national aviation industry are the most important things.