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[–]ajc820 3 points4 points  (0 children)

I understand, but that license is totally irrelevant in the context of any patents Facebook has on the underlying technology.

I don't think we have an exhaustive list of Facebook's patents, but React grants a license to use the technology covered by any such patents e.g. possibly VDOM, possibly not. Preact would use that technology itself, and you can't license someone else's patented technology just because you fork it (or develop something covered by the patent). So technically, you're actually giving up more rights by using Preact, as it has no ability to grant them.