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 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.

 Using custom versions of pnglibconf.h and pngprefix.h for Chrome.

 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