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## Independent JPEG Group: JPEG release 6b | |
### JPEG License | |
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Must reproduce following license in documentation and/or other materials | |
provided with distribution: | |
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 Group". | |
(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 software". | |
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 vendor. | |
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 paragraphs do. | |
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." | |
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