Its development is one of the most prominent examples of free software; all their source code can be used, freely modified and redistributed by anyone under the terms of the GPL (GNU General Public License, in English: General Public License) and a number of free licenses.
Ukuthuthuka kwayo kungesinye sezibonelo ezivelele zesoftware yamahhala; yonke ikhodi yayo yomthombo ingasetshenziswa ngokukhululeka, iguqulwe futhi isatshalaliswe yinoma ngubani ngaphansi kwemigomo ye-GPL (i-GNU General Public License) namanye amalayisense amahhala.