The updated licence isn’t without controversy: https://discuss.reactjs.org/t/legal-department-did-not-allow-use-of-react/3309/4

That said, I think the issue is that Facebook could revoke your licence to use React if you take legal action against Facebook. I don’t imagine the Koha community is going to do that, so it’s probably not a blocker.

David Cook

Systems Librarian

Prosentient Systems

72/330 Wattle St

Ultimo, NSW 2007

Australia

Office: 02 9212 0899

Direct: 02 8005 0595

From: koha-devel-bounces@lists.koha-community.org [mailto:koha-devel-bounces@lists.koha-community.org] On Behalf Of Kyle Hall
Sent: Tuesday, 20 September 2016 3:24 PM
To: Marc Véron <veron@veron.ch>
Cc: Koha Devel <koha-devel@lists.koha-community.org>
Subject: Re: [Koha-devel] To React or not to React

I did much research on that particular issue and it was put to rest when Facebook updated it's license for React. It looks like the Wikipedia page only has the vaguest reference to that ; )

Regarding licensing:

https://en.wikipedia.org/wiki/React_(JavaScript_library)

See part "Patents clause controversy"