84 lines
3.9 KiB
Markdown
84 lines
3.9 KiB
Markdown
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## Independent JPEG Group: JPEG release 6b
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### JPEG License
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<pre>
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Must reproduce following license in documentation and/or other materials
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provided with distribution:
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The authors make NO WARRANTY or representation, either express or implied,
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with respect to this software, its quality, accuracy, merchantability, or
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fitness for a particular purpose. This software is provided "AS IS",
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and you, its user, assume the entire risk as to its quality and accuracy.
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This software is copyright (C) 1991-1998, Thomas G. Lane.
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All Rights Reserved except as specified below.
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Permission is hereby granted to use, copy, modify, and distribute
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this software (or portions thereof) for any purpose, without fee,
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subject to these conditions:
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(1) If any part of the source code for this software is distributed,
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then this README file must be included, with this copyright and no-warranty
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notice unaltered; and any additions, deletions, or changes to the original
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files must be clearly indicated in accompanying documentation.
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(2) If only executable code is distributed, then the accompanying documentation
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must state that "this software is based in part on the work of the
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Independent JPEG Group".
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(3) Permission for use of this software is granted only if the user accepts
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full responsibility for any undesirable consequences; the authors accept
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NO LIABILITY for damages of any kind.
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These conditions apply to any software derived from or based on the IJG code,
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not just to the unmodified library. If you use our work, you ought to
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acknowledge us.
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Permission is NOT granted for the use of any IJG author's name or company name
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in advertising or publicity relating to this software or products derived
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from it. This software may be referred to only as "the Independent JPEG
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Group's software".
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We specifically permit and encourage the use of this software as the basis
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of commercial products, provided that all warranty or liability claims are
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assumed by the product vendor.
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ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
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sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
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ansi2knr.c is NOT covered by the above copyright and conditions, but instead
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by the usual distribution terms of the Free Software Foundation; principally,
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that you must include source code if you redistribute it.
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(See the file ansi2knr.c for full details.) However, since ansi2knr.c is
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not needed as part of any program generated from the IJG code, this does not
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limit you more than the foregoing paragraphs do.
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The Unix configuration script "configure" was produced with GNU Autoconf.
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It is copyright by the Free Software Foundation but is freely distributable.
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The same holds for its supporting scripts (config.guess, config.sub,
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ltconfig, ltmain.sh). Another support script, install-sh, is copyright
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by M.I.T. but is also freely distributable.
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It appears that the arithmetic coding option of the JPEG spec is covered
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by patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding
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cannot legally be used without obtaining one or more licenses. For this
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reason, support for arithmetic coding has been removed from the free
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JPEG software. (Since arithmetic coding provides only a marginal gain
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over the unpatented Huffman mode, it is unlikely that very many
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implementations will support it.) So far as we are aware, there are
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no patent restrictions on the remaining code.
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The IJG distribution formerly included code to read and write GIF files.
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To avoid entanglement with the Unisys LZW patent, GIF reading support
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has been removed altogether, and the GIF writer has been simplified to
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produce "uncompressed GIFs". This technique does not use the LZW algorithm;
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the resulting GIF files are larger than usual, but are readable by all
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standard GIF decoders.
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We are required to state that "The Graphics Interchange Format(c) is
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the Copyright property of CompuServe Incorporated. GIF(sm) is a
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Service Mark property of CompuServe Incorporated."
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</pre>
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