The GNU General Public License is a free software license by the free software foundation. It is very popular in the free and open source software community.


  1. The freedom to run the program for any purpose.
  2. The freedom to study how the program works and adapt it to your needs.
  3. The freedom to redistribute copies so you can help your neighbor.
  4. The freedom to improve the program and release your improvements to the public, so that the whole community benefits.


  • Every copy of the program must be accompanied by the license text.
  • Every copy of the program hast to be distributed with the human readable sourcecode.
  • Every modification or derived work based on the program must be licensed under the GNU GPL, too.