1(Copied from the README.) 2 3-------------------------------------------------------------------------------- 4 5The authors make NO WARRANTY or representation, either express or implied, 6with respect to this software, its quality, accuracy, merchantability, or 7fitness for a particular purpose. This software is provided "AS IS", and you, 8its user, assume the entire risk as to its quality and accuracy. 9 10This software is copyright (C) 1991-1998, Thomas G. Lane. 11All Rights Reserved except as specified below. 12 13Permission is hereby granted to use, copy, modify, and distribute this 14software (or portions thereof) for any purpose, without fee, subject to these 15conditions: 16(1) If any part of the source code for this software is distributed, then this 17README file must be included, with this copyright and no-warranty notice 18unaltered; and any additions, deletions, or changes to the original files 19must be clearly indicated in accompanying documentation. 20(2) If only executable code is distributed, then the accompanying 21documentation must state that "this software is based in part on the work of 22the Independent JPEG Group". 23(3) Permission for use of this software is granted only if the user accepts 24full responsibility for any undesirable consequences; the authors accept 25NO LIABILITY for damages of any kind. 26 27These conditions apply to any software derived from or based on the IJG code, 28not just to the unmodified library. If you use our work, you ought to 29acknowledge us. 30 31Permission is NOT granted for the use of any IJG author's name or company name 32in advertising or publicity relating to this software or products derived from 33it. This software may be referred to only as "the Independent JPEG Group's 34software". 35 36We specifically permit and encourage the use of this software as the basis of 37commercial products, provided that all warranty or liability claims are 38assumed by the product vendor. 39 40 41ansi2knr.c is included in this distribution by permission of L. Peter Deutsch, 42sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA. 43ansi2knr.c is NOT covered by the above copyright and conditions, but instead 44by the usual distribution terms of the Free Software Foundation; principally, 45that you must include source code if you redistribute it. (See the file 46ansi2knr.c for full details.) However, since ansi2knr.c is not needed as part 47of any program generated from the IJG code, this does not limit you more than 48the foregoing paragraphs do. 49 50The Unix configuration script "configure" was produced with GNU Autoconf. 51It is copyright by the Free Software Foundation but is freely distributable. 52The same holds for its supporting scripts (config.guess, config.sub, 53ltconfig, ltmain.sh). Another support script, install-sh, is copyright 54by M.I.T. but is also freely distributable. 55 56It appears that the arithmetic coding option of the JPEG spec is covered by 57patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot 58legally be used without obtaining one or more licenses. For this reason, 59support for arithmetic coding has been removed from the free JPEG software. 60(Since arithmetic coding provides only a marginal gain over the unpatented 61Huffman mode, it is unlikely that very many implementations will support it.) 62So far as we are aware, there are no patent restrictions on the remaining 63code. 64 65The IJG distribution formerly included code to read and write GIF files. 66To avoid entanglement with the Unisys LZW patent, GIF reading support has 67been removed altogether, and the GIF writer has been simplified to produce 68"uncompressed GIFs". This technique does not use the LZW algorithm; the 69resulting GIF files are larger than usual, but are readable by all standard 70GIF decoders. 71 72We are required to state that 73 "The Graphics Interchange Format(c) is the Copyright property of 74 CompuServe Incorporated. GIF(sm) is a Service Mark property of 75 CompuServe Incorporated." 76