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Independent
The Independent JPEG Group's JPEG software README for release 6b of 27-Mar-1998
JPEG Group
This distribution contains the sixth public release of the Independent JPEG Group's free JPEG software. You are welcome to redistribute this software
License
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 up-
dates 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 committee.
LEGAL ISSUES
In plain English:
We don't promise that this software works. (But if you find any bugs, please let us know!) You can use this software for whatever you want. You don't
have to pay us. 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. 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:
. 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.
. If only executable code is distributed, then the accompanying documentation must state that "this software is based in part on the work of the In-
dependent JPEG Group".
. 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 ack-
nowledge 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 deri-
ved 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 as-
sumed 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 para-
graphs do. The Unix configuration script "configure" was produced with GNU Autoconf. It is copyright by the Free Software Foundation but is freely dis-
tributable. 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."
Internet Soft-
Copyright (c) 1996 by Internet Software Consortium.
ware Consor-
Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright no-
tium-IBM
tice and this permission notice appear in all copies.
License
THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RE-
SULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Portions Copyright (c) 1995 by International Business Machines, Inc.
International Business Machines, Inc. (hereinafter called IBM) grants permission under its copyrights to use, copy, modify, and distribute this Software
with or without fee, provided that the above copyright notice and all paragraphs of this notice appear in all copies, and that the name of IBM not be used
in connection with the marketing of any product incorporating the Software or modifications thereof, without specific, written prior permission.
To the extent it has a right to do so, IBM grants an immunity from suit under its patents, if any, for the use, sale or manufacture of products to the extent
that such products are used for performing Domain Name System dynamic updates in TCP IP networks by means of the Software. No immunity is
granted for any product per se or for any other function of any product.
THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTA-
BILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSE-
QUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE, EVEN IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
Cette version du manuel est valable au moment de son impression, mais cette validité ne peut être entièrement garantie pour l'avenir. Pour
plus d'informations, consultez la première page, qui comporte un avertissement complet.
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