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I am curious to hear of anyone who has reviewed this license with their lawyers / legal departments and received a positive, non-cautionary response to go ahead and use the software and libraries covered under it.

Google hasn't specifically said they're using React (which uses the same terms on the patent licensing) but they did review and suggest changes originally and have stated that the current license meets their needs.

There are other companies (I would be betraying confidences to list who) that have looked at it and decided not to use it because of the strong retaliation clause. I should elaborate that those companies are not planning to sue FB as far as I know, but they want to preserve the opportunity to do so (i.e. they don't want to de-weaponize their patent portfolio with respect to FB).

I'm not able to name names, but legally speaking, it's no worse than MIT or BSD. Sure, there's a retaliation clause, but that's just affirmation of what companies who publish with the others aren't telling you.

In effect, it's more, not less, permissive and honest. INAL, but that's what I've been told by one.

The React wiki has a non exhaustive list of users[0] which includes some rather large companies (BBC, Airbnb, Automattic, Atlassian, eBay, Netflix, etc.). I presume most of those larger companies had their legal departments approve its use.

[0] https://github.com/facebook/react/wiki/Sites-Using-React

That may be the case, but I personally would be surprised. My impression is that most companies don't do a good job of managing and monitoring dependency licensing.

I have seen tooling that analyzes licenses, but not for node or client-side javascript. Maybe I'm just in the dark.

That may be true in general but the React license has generated a lot of buzz. If you look at pretty much any Facebook project posted on HN, you'll find that one of the top comments is about the license. Also, the decision to use React is impactful enough that I'd expect most tech CTOs to know about it. I grant you that some might not take the license issue seriously enough to discuss it with legal counsel.

To answer your original question, I found this statement by Automattic's legal counsel[0]:

> “Automattic looked at the legal issues with Facebook’s patent license on React,” Sieminski said. “The termination provisions of the patent license aren’t ideal, but are not a blocker to using React as part of Calypso.”

[0] https://wptavern.com/automattic-will-continue-to-use-react-j...

FYI, my React/Redux links list has a section pointing to discussion on the PATENTS license, including Facebook's official FAQ on the topic: https://github.com/markerikson/react-redux-links/blob/master... .

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