Some of the major Free and Open Source (FOSS) projects use contributory copyright assignments and licenses to clarify the ownership of developer's contributions and to allow the project to grant sublicenses and enforce copyright claims in case of license violations. The paper gives an overview of typical provisions of these agreements and provides an analysis of the private international law principles applicable in Europe, United States, and Japan. As a conclusion, the paper suggests an internationalisation strategy for FOSS projects. FOSS copyright assignments and licenses should implement choice-of-law clauses to foster legal certainty for projects.
