Permission to use, copy, modify, and distribute this software and 
its documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and 
that both that copyright notice and this permission notice appear in
supporting documentation. This software is provided "as is" without
express or implied warranty. 

This package is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This package is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>

On Debian systems, the complete text of the GNU General
Public License version 2 can be found in "/usr/share/common-licenses/GPL-2". 

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:

1. Redistributions of source code must retain the above copyright
    notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
   notice, disclaimer, and this list of conditions in the documenta-
   tion and/or other materials provided with the distribution.
 3. All advertising materials mentioning features or use of this
    software must display the following acknowledgment:

This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates. 

Here is the copyright and license for libpng:
. 
  libpng versions 1.2.6, August 15, 2004, through 1.5.2, March 31, 2011, are
  Copyright (c) 2004, 2006-2011 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

  (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

  Authors and maintainers:
  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
  libpng versions 0.97, January 1998, through 1.2.26 - April 2, 2008: Glenn
  See also "Contributing Authors", below.


  COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:

  If you modify libpng you may insert additional notices immediately following
  this sentence.

  libpng versions 1.2.6, August 15, 2004, through 1.2.26, April 2, 2008, are
  Copyright (c) 2004, 2006-2008 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, 2000 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.

  contrib/pngsuite:
  --------
  (c) Willem van Schaik, 1999, 2011

  Permission to use, copy, modify, and distribute these images for any
  purpose and without fee is hereby granted. 

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

On Debian systems, the full text of the Apache License
can be found in the file `/usr/share/common-licenses/Apache-2.0'. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.