> closed source
That's not really the problem here. The problem is that by using React, even in a closed source context, you are potentially setting yourself up to not successfully make an IP claim against facebook, even for unrelated technologies.
That's not really the problem here. The problem is that by using React, even in a closed source context, you are potentially setting yourself up to not successfully make an IP claim against facebook, even for unrelated technologies.
You give up your right to sue facebook with ALL your patents while facebook only gives up the right to sue you with their REACT patent. We don't even know if there is such a thing as a "react patent".
If you live in a jurisdiction where the concept of software patents are void, as the GP indicates, the patent clause in the license is meaningless because there cannot be any patents on React in that jurisdiction.
The way I understood this conversation was that BMW (continuing your example) cannot sue facebook if facebook infringes them on an of their car patents but it's not a right or a grant or even a license of any sort.