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A comment on Explaining React's license. Parent comment
> A "Necessary Claim" is a claim of a patent owned by Facebook that is necessarily infringed by the Software standing alone.
So when they say "license under any Necessary Claims" they are granting a patent license, the copyright license in the LICENSE file is separate.
The FAQ link provided by silentstreet makes it very clear:
> Does termination of the additional patent grant in the Facebook BSD+Patents license cause the copyright license to also terminate? > > No.
https://code.facebook.com/pages/850928938376556
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> A "Necessary Claim" is a claim of a patent owned by Facebook that is necessarily infringed by the Software standing alone.
So when they say "license under any Necessary Claims" they are granting a patent license, the copyright license in the LICENSE file is separate.
The FAQ link provided by silentstreet makes it very clear:
> Does termination of the additional patent grant in the Facebook BSD+Patents license cause the copyright license to also terminate? > > No.
https://code.facebook.com/pages/850928938376556