This is similar to the Apache License, which allows developers to use the project with the confidence that we grant a license to any patents that may affect the project. This is a grant we use for all of our projects and is not anything specific to Proxygen.
I am sorry to point this out, but the patent license of Proxygen does not look similar to that of Apache License for two reasons.
- the license is terminated when one files a claim against _any_ of Facebook's software or services (IIRC Apache License gets terminated only when filed against the software)
- the license also terminates when you claim that "any right in any patent claim of Facebook is invalid or unenforceable"
The second clause seems very agressive (or pro-patent) to me, which makes me feel sorry for the developers of Proxygen, since IMO such a clause would harm the acceptance of the software outside Facebook.
It would be great if you reconsider the patent license.
Disclaimer: I am developer of H2O, an open-source HTTP/1 and HTTP/2 library, so there is obviously a conflict of interest here. But I wanted to leave a comment anyways since, honestly, I feel sorry if my friends at Facebook needs to go with this kind of license.
