The files in the base, psi, lib, toolbin, examples, doc and man
directories (folders) and any subdirectories (sub-folders)
thereof are part of GPL Ghostscript.
The files in the Resource directory and any subdirectories thereof
are also part of GPL Ghostscript, with the explicit exception of
the files in the CMap subdirectory. The CMap files are copyright
Adobe Systems Incorporated and covered by a separate license
which permits only verbatim distribution.
GPL Ghostscript is free software; you can redistribute it and/or
modify it under the terms 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.
GPL Ghostscript is distributed in the hope that it 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 doc/COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place Suite 330, Boston, MA
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
GPL Ghostscript 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