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NVIDIA could have violated some patents with their design themselves (even unknowingly). There are legitimate reasons why NVIDIA wouldn't want the leak to happen, even if other companies likely wouldn't touch it.

I doubt China would have any qualms using the information

If you're in certain countries you can't do anything with the leaked information officially. But you can still look at it and learn from it without telling anyone. As long as you conceal the trail, which shouldn't be that hard, you're good to use it.

On top of that, there's the issue of potentially violating patents the other poster raised.

I'd say those are pretty good arguments for nVidia to try to prevent this scenario.