 GitHub has become the most popular hosting site in the world for open-source software, and this, together with the ease of forking and the visibility of forks has made it a popular way for contributors to make changes, large and small.While copyright is the primary legal mechanism that FOSS authors use to ensure license compliance for their software, other mechanisms such as legislation, software patents, and trademarks have uses also.In response to legal issues with patents and the DMCA, the Free Software Foundation released version 3 of its GNU Public License in 2007 that explicitly addressed the DMCA's digital rights management (DRM) provisions and patent rights.