The files in this directory are from version 1.0.6 of the PNG reference
library, but have been heavily modified by Stephen Turner for use in analog.
In particular:
  * Only functions I use in analog have been retained;
  * Most source comments have been removed.
Therefore these routines are NOT SUITABLE for use in your own program.
Get the latest version of libpng from
  http://www.libpng.org/pub/png/libpng.html
instead.

Many thanks to the authors for their excellent routines and generous licence.

=== AUTHORS' COPYRIGHT AND LICENCE START HERE ===

COPYRIGHT NOTICE:

Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
(libpng versions 0.5, May 1995, through 0.89c, May 1996)
Copyright (c) 1996, 1997 Andreas Dilger
(libpng versions 0.90, December 1996, through 0.96, May 1997)
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)

For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:

   John Bowler
   Kevin Bracey
   Sam Bushell
   Andreas Dilger
   Magnus Holmgren
   Tom Lane
   Dave Martindale
   Glenn Randers-Pehrson
   Eric S. Raymond
   Greg Roelofs
   Guy Eric Schalnat
   Paul Schmidt
   Tom Tanner
   Willem van Schaik
   Tim Wegner

The PNG Reference Library is supplied "AS IS".  The Contributing Authors
and Group 42, Inc. disclaim all warranties, expressed or implied,
including, without limitation, the warranties of merchantability and of
fitness for any purpose.  The Contributing Authors and Group 42, Inc.
assume no liability for direct, indirect, incidental, special, exemplary,
or consequential damages, which may result from the use of the PNG
Reference Library, even if advised of the possibility of such damage.

Permission is hereby granted to use, copy, modify, and distribute this
source code, or portions hereof, for any purpose, without fee, subject
to the following restrictions:

 1. The origin of this source code must not be
    misrepresented.

 2. Altered versions must be plainly marked as such
    and must not be misrepresented as being the
    original source.

 3. This Copyright notice may not be removed or
    altered from any source or altered source
    distribution.

The Contributing Authors and Group 42, Inc. specifically permit, without
fee, and encourage the use of this source code as a component to
supporting the PNG file format in commercial products.  If you use this
source code in a product, acknowledgment is not required but would be
appreciated.

A "png_get_copyright" function is available, for convenient use in "about"
boxes and the like:

   printf("%s",png_get_copyright(NULL));

Also, the PNG logo (in PNG format, of course) is supplied in the
file "pngnow.png".

Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
certification mark of the Open Source Initiative.

Glenn Randers-Pehrson
randeg@alum.rpi.edu
March 21, 2000
