LibPNG, version 1.6.37

libpng is the official PNG reference library.

Used in the qpng image plugin. Configure with -system-libpng or -no-libpng to avoid.

The sources can be found in qt-everywhere-src-5.15.2/qtbase/src/3rdparty/libpng.

Project Homepage, upstream version: 1.6.37

 Copyright (c) 1998-2018 Glenn Randers-Pehrson
 Copyright (c) 2000-2017 Simon-Pierre Cadieux
 Copyright (c) 2000-2017 Eric S. Raymond
 Copyright (c) 2000-2017 Mans Rullgard
 Copyright (c) 2000-2019 Cosmin Truta
 Copyright (c) 2000-2017 Gilles Vollant
 Copyright (c) 2000-2017 James Yu
 Copyright (c) 2000-2017 Mandar Sahastrabuddhe
 Copyright (c) 1998-2000 Tom Lane
 Copyright (c) 1998-2000 Willem van Schaik
 Copyright (c) 1996-1997 Andreas Dilger
 Copyright (c) 1996-1997 John Bowler
 Copyright (c) 1996-1997 Kevin Bracey
 Copyright (c) 1996-1997 Sam Bushell
 Copyright (c) 1996-1997 Magnus Holmgren
 Copyright (c) 1996-1997 Greg Roelofs
 Copyright (c) 1996-1997 Tom Tanner
 Copyright (c) 1995-1996 Dave Martindale
 Copyright (c) 1995-1996 Paul Schmidt
 Copyright (c) 1995-1996 Tim Wegner
 Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

libpng License and PNG Reference Library version 2.

 COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
 =========================================

 PNG Reference Library License version 2
 ---------------------------------------

  * Copyright (c) 1995-2019 The PNG Reference Library Authors.
  * Copyright (c) 2018-2019 Cosmin Truta.
  * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
  * Copyright (c) 1996-1997 Andreas Dilger.
  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

 The software is supplied "as is", without warranty of any kind,
 express or implied, including, without limitation, the warranties
 of merchantability, fitness for a particular purpose, title, and
 non-infringement.  In no event shall the Copyright owners, or
 anyone distributing the software, be liable for any damages or
 other liability, whether in contract, tort or otherwise, arising
 from, out of, or in connection with the software, or the use or
 other dealings in the software, even if advised of the possibility
 of such damage.

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

  1. The origin of this software must not be misrepresented; you
     must not claim that you wrote the original software.  If you
     use this software in a product, an acknowledgment in the product
     documentation would be appreciated, but is not required.

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

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


 PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
 -----------------------------------------------------------------------

 libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are
 Copyright (c) 2000-2002, 2004, 2006-2018 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.