File:535px-Heckert GNU white.svg.png

Summary
Unix the symbol of the GNU

Copyright states "Copyleft: This work of art is free; you can redistribute it and/or modify it according to terms of the Free Art License. You will find a specimen of this license on the site Copyleft Attitude http://artlibre.org/licence/lal/en/ as well as on other sites. "See this page also http://www.gnu.org/