[JoshMnem]

Yes... I'm really surprised that people aren't talking about this more seriously. They have removed the worst of it, but it still looks like it gives Facebook an advantage in any patent conflicts with any company that uses React, Immutable, Hack, HHVM, GraphQL, etc. anywhere in the dependencies. It appears that the PATENTS file claims that if Facebook infringes on your patents, you can't defend your patents without a risk of immediately losing the ability to use React (or other Facebook library). Maybe a lawyer would be able to make more sense of that PATENTS file.

I'm surprised that Apple might be using React, since they have had big patent battles with Facebook:

http://www.meetup.com/ReactJS-San-Francisco/events/227071839...

http://www.theguardian.com/technology/2015/jul/21/facebook-g...

I've heard that Google doesn't use React, but I don't know how long companies will be able to do that as Facebook libraries increasingly become dependencies of other libraries.

[spicyj]

Google does use React now; as far as I know they are happy with the current version of the PATENTS file.

[JoshMnem]

The last I heard, they weren't allowed to use it. If you could link to a Google product that uses React, I'd like to take a look.

[spicyj]

I don't have links to any; they might be all internal. The current iteration of the patent grant was developed in collaboration with Google to meet their needs, so if there is any complaint they still have with it, that is news to me.

Only public evidence I have of this is Firebase (owned by Google) being unwilling to use React and then happy with the new license:

https://twitter.com/KanYang/status/586636624349569024

[JoshMnem]

I would like to find out more specific information. It seems like the section of the license below says that you can never make any patent claim against Facebook or you lose rights to use the software. Doesn't that mean that Google could never initiate patent claims against Facebook, while Facebook could still initiate patent claims against Google? It seems strange that Google (or Apple) would do that. I am not a lawyer though, and the PATENTS file may not mean that.

> The license granted hereunder will terminate, automatically and without notice, if you (or any of your subsidiaries, corporate affiliates or agents) initiate directly or indirectly, or take a direct financial interest in, any Patent Assertion: (i) against Facebook or any of its subsidiaries or corporate affiliates, (ii) against any party if such Patent Assertion arises in whole or in part from any software, technology, product or service of Facebook or any of its subsidiaries or corporate affiliates, or (iii) against any party relating to the Software.

[etjossem]

Citation? Which projects use it?

[JoshMnem]

Here is another large project (Drupal) that decided against React because of the PATENTS file: http://buytaert.net/selecting-a-client-side-framework-for-dr...

"The Virtual DOM, among React's most compelling features, has also seen its core ideas filter into other framework projects. But more importantly, React is licensed with what I believe to be a potentially unacceptable patent clause, which states that an organization can no longer use React once it sues Facebook for any (unrelated) patent infringement. This has already generated some concerted pushback from both WordPress's Calypso and React contributors."