You can't legally use React without a patents license. The difference between the patents grant and the copyright license is mostly in the timeframe they cover (20 years for patents, 100+ years or whatever for copyright).
That nobody seems to know whether there are in fact any patents licensed by the patent grant within React is one of the most frustrating things about it.
Agreed. It gives the entire debate a very metaphysical quality. How can I determine the value of a patent grant when I don't know what the patents are, or if they even exist?
