| ## Independent JPEG Group: JPEG release 6b |
| |
| ### JPEG License |
| |
| ``` |
| **************************************************************************** |
| |
| Copyright (C) 1991-1998, Thomas G. Lane. |
| |
| 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. |
| |
| 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. |
| |
| 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." |
| |
| **************************************************************************** |
| ``` |
| |
