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The Independent JPEG Group’s JPEG Software
The software included in this product contains copyrighted software that is licensed under the JPEG license.
• JPEG license
- Code project – Generating Outline OpenGL, Libjpeg
This distribution contains the sixth public release of the
Independent JPEG Group’s free JPEG software. You are
welcome to redistribute this software and to use it for any
purpose, subject to the conditions under LEGAL ISSUES, below.
Serious users of this software (particularly those incorporating
it into larger programs) should contact IJG at jpeg-info@
uunet.uu.net to be added to our electronic mailing list. Mailing
list members are notified of updates and have a chance to
participate in technical discussions, etc.
This software is the work of Tom Lane, Philip Gladstone, Jim
Boucher, Lee Crocker, Julian Minguillon, Luis Ortiz, George
Phillips, Davide Rossi, Guido Vollbeding, Ge’ Weijers, and
other members of the Independent JPEG Group.
IJG is not affiliated with the official ISO JPEG standards
In plain English:
1. We don’t promise that this software works. (But if you find
any bugs, please let us know!)
2. You can use this software for whatever you want. You
don’t have to pay us.
3. You may not pretend that you wrote this software. If you
use it in a program, you must acknowledge somewhere in
your documentation that you’ve used the IJG code.
The authors make NO WARRANTY or representation, either
express or implied, with respect to this software, its quality,
accuracy, merchantability, or fitness for a particular purpose.
This software is provided "AS IS", and you, its user, assume
the entire risk as to its quality and accuracy.
This software is copyright (C) 1991-1998, Thomas G. Lane.
All Rights Reserved except as specified below.
Permission is hereby granted to use, copy, modify, and
distribute this software (or portions thereof) for any purpose,
without fee, subject to these conditions:
(1) If any part of the source code for this software is
distributed, then this README file must be included, with
this copyright and no-warranty notice unaltered; and any
additions, deletions, or changes to the original files must be
clearly indicated in accompanying documentation.
(2) If only executable code is distributed, then the
accompanying documentation must state that "this software
is based in part on the work of the Independent JPEG
(3) Permission for use of this software is granted only if
the user accepts full responsibility for any undesirable
consequences; the authors accept NO LIABILITY for
damages of any kind.
These conditions apply to any software derived from or
based on the IJG code, not just to the unmodified library. If
you use our work, you ought to acknowledge us.
Permission is NOT granted for the use of any IJG author’s
name or company name in advertising or publicity relating
to this software or products derived from it. This software
may be referred to only as "the Independent JPEG Group’s
We specifically permit and encourage the use of this
software as the basis of commercial products, provided that
all warranty or liability claims are assumed by the product
ansi2knr.c is included in this distribution by permission of L.
Peter Deutsch, sole proprietor of its copyright holder, Aladdin
Enterprises of Menlo Park, CA. ansi2knr.c is NOT covered by
the above copyright and conditions, but instead by the usual
distribution terms of the Free Software Foundation; principally,
that you must include source code if you redistribute it. (See
the file ansi2knr.c for full details.) However, since ansi2knr.
c is not needed as part of any program generated from the
IJG code, this does not limit you more than the foregoing
The Unix configuration script "configure" was produced
with GNU Autoconf. It is copyright by the Free Software
Foundation but is freely distributable. The same holds for its
supporting scripts (config.guess, config.sub, ltconfig, ltmain.
sh). Another support script, install-sh, is copyright by M.I.T.
but is also freely distributable.
It appears that the arithmetic coding option of the JPEG spec
is covered by patents owned by IBM, AT&T, and Mitsubishi.
Hence arithmetic coding cannot legally be used without
obtaining one or more licenses. For this reason, support for
arithmetic coding has been removed from the free JPEG
software. (Since arithmetic coding provides only a marginal
gain over the unpatented Huffman mode, it is unlikely that
very many implementations will support it.) So far as we are
aware, there are no patent restrictions on the remaining code.
The IJG distribution formerly included code to read and write
GIF files. To avoid entanglement with the Unisys LZW patent,
GIF reading support has been removed altogether, and the
GIF writer has been simplified to produce "uncompressed
GIFs". This technique does not use the LZW algorithm; the
resulting GIF files are larger than usual, but are readable by
all standard GIF decoders.
We are required to state that
"The Graphics Interchange Format(c) is the Copyright
property of CompuServe Incorporated. GIF(sm) is a Service
Mark property of CompuServe Incorporated."