+ restrictions, as long as you license it to your customers under the same license.
+ (Note: this is just a summary of the terms of the GPL; always read the
+ <a href="http://www.gnu.org/copyleft/gpl.html">full text</a> of the license
+ and preferably consult a lawyer if you have any doubt whether what you want to
+ do is permitted by the GPL.)</p>