The Independent JPEG Groupfs JPEG software
README for release 6b of 27-Mar-1998
====================================

This distribution contains the sixth public release of the Independent
JPEG Groupfs free JPEG software. You are welcome to redistribute this
software 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 updates 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, Gef 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:

1.We donft promise that this software works. (But if you find any bugs,
please let us know!)
2.You can use this software for whatever you want. You donft have to
pay us.
3.You may not pretend that you wrote this software. If you use it in
a program, you must acknowledge somewhere in your documentation
that youfve 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 gAS ISh, 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 gthis software is based in part on the
work of the Independent JPEG Grouph.

(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 authorfs 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
gthe Independent JPEG Groupfs softwareh.

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.

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 paragraphs do.

The Unix configuration script gconfigureh was produced with GNU
Autoconf. It is copyright by the Free Software Foundation but is
freely distributable. 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 guncompressed GIFsh. 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."