COPYRIGHT NOTICE, DISCLAIMER, and LICENSE

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PNG Reference Library License version 2

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 * 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)

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libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are

    Simon-Pierre Cadieux

    Eric S. Raymond

    Mans Rullgard

    Cosmin Truta

    Gilles Vollant

    James Yu

    Mandar Sahastrabuddhe

    Google Inc.

    Vadim Barkov

    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.

files that are distributed with libpng have other copyright owners, 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

    John Bowler

    Kevin Bracey

    Sam Bushell

    Magnus Holmgren

    Greg Roelofs

    Tom Tanner

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

    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.

 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.