https://github.com/facebook/hhvm/blob/master/hphp/hack/PATEN...
https://github.com/facebook/hhvm/blob/master/hphp/hack/PATEN...
But this basically gives a BSD plus patent grant, and reverts to BSD if there are any patent litigations. And now people are complaining.
https://medium.com/@dwalsh.sdlr/react-facebook-and-the-revok...
It gives you more rights. Full stop, end of story.
React has managed to bring together people in C#, Python, Ruby, and Erlang to name a few languages... who all previously used different frameworks, or just jQuery.
/sarcasm
This is a multi horse race and even if you are not scared of patents it might be unwise to bet on the horse you think will scare other people. (Case in point, Wordpress.)
Fact of the matter is, it's just posturing. Software patents are utter bullshit and the facebook license clause reflects this.