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Re:Mailpile: Let’s take email back by nhaehnle on Sunday August 04, 2013 @07:28AM (#6155325)
It might also discourage contributors who don't want a transition to a different license. After all, contributor agreements also give the power to go closed source later on.
Re:Mailpile: Let’s take email back by binarycrusader on Sunday August 04, 2013 @09:01PM (#6157820)
Like I said, tradeoffs. LLVM for example doesn't require copyright assignment, but does require a contributor agreement for patent purposes for significant contributions.

Contributor agreements are a necessary mechanism to protect the project and ensure its future when dealing with patents or preparing for the potential of relicensing.