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Independent JPEG Group License
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LEGAL ISSUES
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In plain English:
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1. We don't promise that this software works. (But if you find any bugs, please
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let us know!)
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2. You can use this software for whatever you want. You don't have to pay us.
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3. You may not pretend that you wrote this software. If you use it in a program,
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you must acknowledge somewhere in your documentation that you've used the
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IJG code.
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In legalese:
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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", and you,
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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. All Rights Reserved
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except as specified below.
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Permission is hereby granted to use, copy, modify, and distribute this software
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(or portions thereof) for any purpose, without fee, subject to these conditions:
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(1) If any part of the source code for this software is distributed, then
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this README file must be included, with this copyright and no-warranty notice
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unaltered; and any additions, deletions, or changes to the original files
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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 Independent
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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 NO
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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 acknowledge
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us.
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Permission is NOT granted for the use of any IJG author's name or company
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name 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 Group's
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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,
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CA. 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. (See the file ansi2knr.c
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for full details.) However, since ansi2knr.c is not needed as part of any
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program generated from the IJG code, this does not limit you more than the
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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, ltconfig,
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ltmain.sh). Another support script, install-sh, is copyright by M.I.T. but
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is also freely distributable.
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It appears that the arithmetic coding option of the JPEG spec is covered by
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patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot
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legally be used without obtaining one or more licenses. For this reason, support
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for arithmetic coding has been removed from the free JPEG software. (Since
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arithmetic coding provides only a marginal gain over the unpatented Huffman
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mode, it is unlikely that very many implementations will support it.) So far
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as we are aware, there are no patent restrictions on the remaining code.
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The IJG distribution formerly included code to read and write GIF files. To
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avoid entanglement with the Unisys LZW patent, GIF reading support has been
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removed altogether, and the GIF writer has been simplified to produce "uncompressed
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GIFs". This technique does not use the LZW algorithm; the resulting GIF files
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are larger than usual, but are readable by all standard GIF decoders.
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We are required to state that
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"The Graphics Interchange Format(c) is the Copyright property of CompuServe
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Incorporated. GIF(sm) is a Service Mark property of CompuServe Incorporated."
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