libpng License Agreement

 COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:

 If you modify libpng you may insert additional notices immediately following

 this sentence.

 This code is released under the libpng license.

 libpng versions 1.2.6, August 15, 2004, through 1.6.16, December 22, 2014, are

 Copyright (c) 2004, 2006-2014 Glenn Randers-Pehrson, and are

 distributed according to the same disclaimer and license as libpng-1.2.5

 with the following individual added to the list of Contributing Authors

    Cosmin Truta

 libpng versions 1.0.7, July 1, 2000, through 1.2.5 - October 3, 2002, are

 Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are

 distributed according to the same disclaimer and license as libpng-1.0.6

 with the following individuals added to the list of Contributing Authors

    Simon-Pierre Cadieux

    Eric S. Raymond

    Gilles Vollant

 and with the following additions to the disclaimer:

    There is no warranty against interference with your enjoyment of the

    library or against infringement.  There is no warranty that our

    efforts or the library will fulfill any of your particular purposes

    or needs.  This library is provided with all faults, and the entire

    risk of satisfactory quality, performance, accuracy, and effort is with

    the user.

 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are

 Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are

 distributed according to the same disclaimer and license as libpng-0.96,

 with the following individuals added to the list of Contributing Authors:

    Tom Lane

    Glenn Randers-Pehrson

    Willem van Schaik

 libpng versions 0.89, June 1996, through 0.96, May 1997, are

 Copyright (c) 1996, 1997 Andreas Dilger

 Distributed according to the same disclaimer and license as libpng-0.88,

 with the following individuals added to the list of Contributing Authors:

    John Bowler

    Kevin Bracey

    Sam Bushell

    Magnus Holmgren

    Greg Roelofs

    Tom Tanner

 libpng versions 0.5, May 1995, through 0.88, January 1996, are

 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.

 For the purposes of this copyright and license, "Contributing Authors"

 is defined as the following set of individuals:

    Andreas Dilger

    Dave Martindale

    Guy Eric Schalnat

    Paul Schmidt

    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.