Contributor License Agreement
From the Wikipedia:
"A Contributor License Agreement (CLA) defines the terms under which intellectual property has been contributed to a company/project, typically software under an open source license.
Creative Commons alumna Catharina Maracke released the next generation legal and technical project, Contributor Agreements which provides important contributions to international legal technical aspects of CLAs and lessons learned from previous CLA projects." (https://en.wikipedia.org/wiki/Contributor_License_Agreement)