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GPL is the license which Richard Stallman and Free Software Foundation (FSF) made with the intention of achieving the principles of 'Free Software'. It also refers to Code of Conduct that should be observed in the Free/Open Software community and Constitution of Free Software Movement as well. The most salient feature of GPL is that derivative programs must be distributed in GPL. However, the specific criteria have not been set yet. In addition, several issues such as dealing of patent and compatibility with other free/open source licenses are left to be solved. After occasional discussion about problems and revision of GPL, FSF called a serious attention to the first discussion draft of 'GPL version 3' in January 2006. Then, the second discussion draft was announced in July 2006 from suggestions through the Internet and discussions through international conferences. The discussion has continued (as of February, 2007) in order to announce the final draft at the beginning of 2007. The second draft includes the followings: (1) the threat of software patents and countermeasures against it, (2) the problems caused from increased DRM technology and solutions, and (3) the ways to ensure the flexibility of GPL by allowing licensees to add new permission or requests. However, there exist not a few opposite views on concrete issues such as DRM related matters, which is mainly resulted from different views on ideology and goals of Free/Open source software. Therefore, narrowing and overcoming the gap of differences will smooth the path to conversion to 'GPL version 3' and lead to the development of Free/Open source Software.