policy for acceptable licenses from contributors
We should have a policy statement about what licenses we will accept for contributions to Core Tor. Maybe it should go into
CodingStandards.md or similar.
It seems like we currently want BSD-licensed code (3-clause?) and maybe don't want copylefted stuff?
Maybe also clarify that patches to an existing file are assumed to be copyright-assigned to us or licensed under the same license as the original file.
Bonus points if there's a well-written rationale for our licensing choices. (But maybe that should be a separate ticket.)