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You lose the patent grant, which applies to all Facebook open source projects (not just React), so they can use all patents they own as part of a defensive portfolio.

If initiating a patent war with Facebook is a foreseeable business outcome for you, then you probably shouldn't use React. I remain convinced that logic applies to only a tiny minority of companies.

What happens if you are not the one who initiated the patent war?

My reading of the license is that you lose Facebook patent grant even if your lawsuit was a response to Facebook's.

I am not a fan of (software) patents, but license restrictions are not limited to them either. So what is your recourse if Facebook decides to infringe yours?

Assuming this is true (IANAL), would you still feel as comfortable advising companies to use React?

I don't begrudge Facebook for their license for the same reasons that Matt stated, but I am highlighting this issue to my clients and would not recommend React's use because of it.

IANAL, but you do not lose the patent grant if your lawsuit is in response to Facebook's. https://github.com/facebook/react/blob/master/PATENTS#L21-L2...

I somehow missed that part. Thanks.

Most people do, which is half the reason so many people obsess about it.

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