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libjpeg
LEGAL ISSUES
============
In plain English:
1. We don’t promise that this software works. (But if
you nd any bugs,
please let us know!)
2. You can use this software for whatever you want.
You don’t 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
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
tness 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 specied 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 le must be included, with this copyright and
no-warranty notice
unaltered; and any additions, deletions, or changes to
the original les
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 unmodied 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 specically 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 le
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 conguration script “congure” was produced
with GNU Autoconf.
It is copyright by the Free Software Foundation but is
freely distributable.
The same holds for its supporting scripts (cong.guess,
cong.sub,
ltcong, 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 les.
To avoid entanglement with the Unisys LZW patent,
GIF reading support has
been removed altogether, and the GIF writer has been
simplied to produce
“uncompressed GIFs”. This technique does not use
the LZW algorithm; the
resulting GIF les are larger than usual, but are
readable by all standard
GIF decoders.
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