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Avisos generales
In legalese:
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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