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by HyprMusic 4775 days ago
It's a contributor license agreement. "Contributor Licence Agreements (CLAs) can be used to enable vendors to easily pursue legal resolution in the case of copyright disputes"[1].

Licensing/copyright can be a messy thing - especially with multiple authors involved. I assume the legal clarity it provides is seen as worthy of the extra hurdle to some of the more risky and/or cautious projects. Plus, depending on the agreement, it allows more freedom for change of license terms without getting all existing contributors to agree - the agreements I've signed have often contained a clause declaring implicit permission (or waiving rights completely).

[1]http://en.wikipedia.org/wiki/Contributor_License_Agreement