Z:gnu-www-ja-gpl-2.0-faq--e086f2-Note that people who make modi/es

Note that people who make modified versions of ABC are not obligated to grant this special exception for their modified versions; it is their choice whether to do so. The GNU General Public License gives permission to release a modified version without this exception; this exception also makes it possible to release a modified version which carries forward this exception.[2] Traducción no oficial.