This License is a kind of copyleft, which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software.
Lizentzia hau copyleft modukoa da, hau da, dokumentu honetatik eratorritako lan guztiek ere libreak izan behar dute zentzu berean. GNU Lizentzia Publiko Orokorra (software librearentzat diseinatutako "copyleft" lizentzia) osatzen du.