The files in the common, doc, main, pcl, pl, psi, pxl, tools, svg
  and xps directories (folders) and any subdirectories (sub-folders)
  thereof are part of GhostPCL, GhostXPS and GhostSVG, collectively
  known as GhostPDL.

  The files in the gs directory (folder) and the subdirectories 
  (sub-folders) thereof are part of GPL Ghostscript, along with
  copies of its dependent third-party libraries. See the file
  gs/LICENSE for information about this directory,

  GhostPDL and GPL Ghostscript are free software; you can redistribute 
  and/or modify them under the terms of the GNU General Public License
  as published by the Free Software Foundation, either version 3 of
  the License, or (at your option) any later version.

  GhostPDL and GPL Ghostscript are distributed in the hope that they 
  will be useful, but WITHOUT ANY WARRANTY; without even the implied 
  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program so you can know your rights and responsibilities.
  It should be in a file named COPYING. If not, write to the
  Free Software Foundation, Inc., 59 Temple Place Suite 330, Boston, MA
  02111-1307, USA.

 ---

  The set of truetype fonts in the urwfonts directory are necessary for 
  the PCL/XL interpreter to function properly but they ARE NOT FREE 
  SOFTWARE and are NOT distributed under the GNU GPL. They can instead 
  be redistributed under the AFPL licence which bars commercial use.

  If your copy of GhostPDL includes these fonts, you should have
  received a copy of the the Aladdin Free Pubilc License, usually
  in a file called COPYING.AFPL. If not, please contact Artifex
  Software, Inc. 7 Mt. Lassen Drive, Suite A-134, San Rafael CA
  94903 USA, or visit http://www.artifex.com/

 ---

  This software (GhostPDL and GPL Ghostscript) contains 
  an implementation of techniques covered by US Patents 5,055,942
  and 5,917,614, and corresponding international patents. These 
  patents are licensed for use with this software under the following 
  grant:

  Whereas, Raph Levien (hereinafter "Inventor") has obtained patent
  protection for related technology (hereinafter "Patented
  Technology"), Inventor wishes to aid the the GNU Free Software
  project in achieving its goals, and Inventor also wishes to
  increase public awareness of Patented Technology, Inventor hereby
  grants a fully paid up, nonexclusive, royalty free license to
  practice the patents listed below ("the Patents") if and only if
  practiced in conjunction with software distributed under the
  terms of any version of the GNU General Public License as
  published by the Free Software Foundation, 59 Temple Place, Suite
  330, Boston, MA 02111. Inventor reserves all other rights,
  including without limitation, licensing for software not
  distributed under the GNU General Public License.

   5055942 Photographic image reproduction device using digital 
           halftoning to screen images allowing adjustable coarseness

   5917614 Method and apparatus for error diffusion screening of 
           images with improved smoothness in highlight and shadow 
           regions