What is the difference between AFPL Ghostscript and GNU Ghostscript?
AFPL Ghostscript is distributed with a license called the Aladdin Ghostscript Free Public License that allows free use, copying, and distribution by end users, but does not allow commercial distribution. AFPL Ghostscript was previously known as Aladdin Ghostscript. GNU Ghostscript is distributed with the GNU General Public License, which allows free use, and free copying and redistribution under certain conditions (including, in some cases, commercial distribution). GNU Ghostscript versions are usually released shortly after the next AFPL Ghostscript version.