# Acknowledgments and Other Issues

Silicon Graphics has seen fit to allow us to give this work away. It is free. There is no support or guarantee of any sort as to its operations, correctness, or whatever. If you do anything useful with all or parts of it you need to honor the copyright notices. It would also be nice to be acknowledged.

## Acknowledgements

The libtiff software was written by Sam Leffler while working for Silicon Graphics.

The LZW algorithm is derived from the compress program (the proper attribution is included in the source code). The Group 3 fax stuff originated as code from Jef Poskanzer, but has since been rewritten several times. The latest version uses an algorithm from Frank Cringle -- consult `libtiff/mkg3states.c` and `libtiff/tif_fax3.h` for further information. The JPEG support was written by Tom Lane and is dependent on the excellent work of Tom Lane and the Independent JPEG Group (IJG) who distribute their work under friendly licensing similar to this software. Joris Van Damme implemented the robust Old JPEG decoder (as included in libtiff since version 3.9.0, there was another Old JPEG module in older releases, which was incomplete and unsuitable for many existing images of that format). JBIG module was written by Lee Howard and depends on JBIG library from the Markus Kuhn. Many other people have by now helped with bug fixes and code; a few of the more persistent contributors have been:

        Bjorn P. Brox
        Dan McCoy
        J.T. Conklin
        Richard Minner
        Frank D. Cringle
        Richard Mlynarik
        Soren Pingel Dalsgaard
        Niles Ritter
        Steve Johnson
        Karsten Spang
        Tom Lane
        Peter Smith
        Brent Roman
        Mike Welles
        Frank Warmerdam
        Greg Ward
        Stanislav Brabec
        Roman Shpount
        Peter Skarpetis
        Arvan Pritchard
        Bernt Herd
        Joseph Orost
        Phil Beffery
        Ivo Penzar
        Francois Dagand
        Albert Chin-A-Young
        Bruce A. Mallett
        Dwight Kelly
        Andrey Kiselev
        Ross Finlayson
        Dmitry V. Levin
        Bob Friesenhahn
        Lee Howard
        Joris Van Damme
        Tavis Ormandy
        Richard Nolde
        Even Rouault

(my apology to anyone that was inadvertently not listed.)

## Use and Copyright

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    Copyright (c) 1988-1997 Sam Leffler
    Copyright (c) 1991-1997 Silicon Graphics, Inc.

    Permission to use, copy, modify, distribute, 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
    publicity 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 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

    IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
    ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
    OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
    WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
    LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
    OF THIS SOFTWARE.

Last updated: $Date: 2016-09-25 20:05:44 $