Tell me a single thing that you make is not a copy of some sorts ?? WS series as explained before by a member is knocked off from some other design.
Again, that is the same racist excuse Indian used to denigrate the Chinese to make themselves feel better.
It also shows a complete lack of understanding of industrial processes.
You cannot "copy" an engine or an airframe like a piece of paper or software code. You need to build an entire industrial infrastructure that can manufacture thousands of parts.
No non-white nation outside China and maybe its East Asian neighbors Japan and S Korea can build an engine like a F404 even if you gave it the blueprints. It simply wouldn't have the infrastructure and India is no different from any other non-white nation.
The WS series from WS-6 to WS-10 to WS-15 were all designed and more importantly made in China. They might have use foreign data (from CMF56,etc) to decrease development time but they were all designed to use Chinese parts from Chinese manufacturers.
Because they use Chinese parts and are built inside a Chinese supply, testing and assembly eco system they can't be stopped by an outside embargo. This is why development in China is so quick and so prolific.
Now Kaveri engine its ours, we can call it ours because it has been designed and developed in India without knocking off others products.
Okay I agree the Kaveri is yours even though you needed assistance from the Russians and French every step of the way to design and test it. It also powers no plane and is therefore pretty much a failure so far. It is surprising that you have such a low and easy to pass standard for India.
Now the WS-10 -- which is designed, manufactured and tested entirely in China and is powering hundreds of Chinese Flankers -- is ours. You can call anything you're jealous of a "copy" but unlike the Kaveri it is designed to work and work entirely with Chinese components.
Now is your time, enjoy it. Our time would come and then we'll enjoy. LOL
Sorry, have you seen the multitudes of killer drones coming out at Zhuhai? They are all powered by Chinese poweplants -- not as well known as the WS-10 or 15 but indicative of the depth and breadth of China's industrial eco system.
India doesn't have a drone yet because it is waiting for an engine.
Sorry, with each new Chinese engine, the gap widens exponentially because it means that the Chinese industrial base can take something it controls entirely to experiment, change and improve while India is still waiting for something that actually works.