This copy of the libpng notices is provided for your convenience.  In case of

any discrepancy between this copy and the notices in the file png.h that is

included in the libpng distribution, the latter shall prevail.

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 1.0.7, July 1, 2000 through 1.6.34, September 29, 2017 are

Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are

derived from libpng-1.0.6, 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

   Mans Rullgard

   Cosmin Truta

   Gilles Vollant

   James Yu

   Mandar Sahastrabuddhe

   Google Inc.

   Vadim Barkov

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.

Some files in the "contrib" directory and some configure-generated

files that are distributed with libpng have other copyright owners and

are released under other open source licenses.

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

Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from

libpng-0.96, 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, are derived from libpng-0.88,

and are 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

Some files in the "scripts" directory have other copyright owners

but are released under this license.

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.

END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.

TRADEMARK:

The name "libpng" has not been registered by the Copyright owner

as a trademark in any jurisdiction.  However, because libpng has

been distributed and maintained world-wide, continually since 1995,

the Copyright owner claims "common-law trademark protection" in any

jurisdiction where common-law trademark is recognized.

OSI CERTIFICATION:

Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is

a certification mark of the Open Source Initiative. OSI has not addressed

the additional disclaimers inserted at version 1.0.7.

EXPORT CONTROL:

The Copyright owner believes that the Export Control Classification

Number (ECCN) for libpng is EAR99, which means not subject to export

controls or International Traffic in Arms Regulations (ITAR) because

it is open source, publicly available software, that does not contain

any encryption software.  See the EAR, paragraphs 734.3(b)(3) and

734.7(b).

Glenn Randers-Pehrson

glennrp at users.sourceforge.net

September 29, 2017