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Appendix
208
11
The Unix configuration script "config-
ure" was produced with GNU Auto-
conf. It is copyright by the Free
Software Foundation but is freely dis-
tributable. The same holds for its sup-
porting scripts (config. guess, config.
sub, ltconfig, ltmain. sh). Another
support script, install-sh, is copyright
by M. I. T. but is also freely distribut-
able.
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 ob-
taining 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 implementa-
tions will support it. ) So far as we are
aware, there are no patent restrictions
on the remaining code.
The IJG distribution formerly includ-
ed 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 usu-
al, but are readable by all standard
GIF decoders.
We are required to state that
TIFF Software
Copyright (c) 1988-1997 Sam Leffler
Copyright (c) 1991-1997 Silicon
Graphics, Inc.
Permission to use, copy, modify, dis-
tribute, and sell this software and its
documentation for any purpose is
hereby granted without fee, provided
that (i) the above copyright notices
and this permission notice appear in
all copies of the software and related
documentation, and (ii) the names of
Sam Leffler and Silicon Graphics may
not be used in any advertising or pub-
licity relating to the software without
the specific, prior written permission
of Sam Leffler and Silicon Graphics.
THE SOFTWARE IS PROVIDED "AS-
IS" AND WITHOUT WARRANTY
OF ANY KIND, EXPRESS, IMPLIED
OR OTHERWISE, INCLUDING
WITHOUT LIMITATION, ANY
WARRANTY OF MERCHANTABIL-
ITY OR FITNESS FOR A PARTICU-
LAR PURPOSE.
IN NO EVENT SHALL SAM LEF-
FLER OR SILICON GRAPHICS BE
LIABLE FOR ANY SPECIAL, INCI-
DENTAL, INDIRECT OR CONSE-
QUENTIAL DAMAGES OF ANY
KIND, OR ANY DAMAGES WHAT-
SOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS,
WHETHER OR NOT ADVISED OF
THE POSSIBILITY OF DAMAGE,
AND ON ANY THEORY OF LIABIL-
ITY, ARISING OUT OF OR IN CON-
NECTION WITH THE USE OR
PERFORMANCE OF THIS SOFT-
WARE.
"The Graphics Interchange Format(c) is
the Copyright property of CompuServe
Incorporated. GIF(sm) is a Service Mark
property of CompuServe Incorporated.
"