So can someone help me untangle how this relates to possible Zstandard patents?
Back some time ago, when all public facebook git repositories had a patent "grant" document, there was some angst about what exactly this meant: https://github.com/facebook/zstd/issues/335 -- this was considered "resolved" when facebook decided to distribute the software under GPLv2, though after reading the relevant sections of GPLv2 I can't say I follow why this was supposed to resolve any uncertainty around potential FB patents of zstd.
BSD doesn't have a patent grant, so doesn't this mean you are only legally free of their patent if you use the GPL code? Also, any independent implementation of the algorithm would be subject to patent fees?
Back some time ago, when all public facebook git repositories had a patent "grant" document, there was some angst about what exactly this meant: https://github.com/facebook/zstd/issues/335 -- this was considered "resolved" when facebook decided to distribute the software under GPLv2, though after reading the relevant sections of GPLv2 I can't say I follow why this was supposed to resolve any uncertainty around potential FB patents of zstd.
Under BCP79 it would be Facebook's duty to disclose any IPR it has in zstd; there are presently no such disclosures registered: https://datatracker.ietf.org/ipr/search/?draft=&rfc=8478&sub...
As far as I can tell, this is good news for people who would like to adopt zstd!