I read the exceptions as a grant of additional rights to mattermost's copyright (but not to third parties), I don't think that conflicts. I'm not sure that the

I read the exceptions as a grant of additional rights to mattermost's copyright (but not to third parties), I don't think that conflicts. I'm not sure that they actually granted a GPL license at all though. I could see this document being read as an advertisement that one might be for sale instead of a grant... (Not a lawyer)