After much consultation the free software foundation introduced the GPLv3 in June 2007. Though two years passed it cant overtake the popular GPLv2, surveys show.Unchallenged in first place, with half of all licenses, is still its predecessor GPL 2.0 that reigned alone for 16 years. The Lesser PGL (LPGL) 2.1 is in second place with around 10%. Chances are it will take GPLv3 a few more years to move up the ranks, but has already positioned itself just after BSD 2.0 at six percent.

Open source knowledge base provider Black Duck Software confirms in a study of most commonly used open source licenses that GNU General PUblic License (GPL) 3.0 is in fifth place overall, with a little over five percent usage.

 What is GNU GPL?

The GNU General Public License is a free, copyleft license for software and other kinds of works.The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. 

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