1The source code to this library used with SDL_image can be found here:
2https://hg.libsdl.org/SDL_image/file/default/external
3---
4COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
5=========================================
6
7PNG Reference Library License version 2
8---------------------------------------
9
10 * Copyright (c) 1995-2019 The PNG Reference Library Authors.
11 * Copyright (c) 2018-2019 Cosmin Truta.
12 * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
13 * Copyright (c) 1996-1997 Andreas Dilger.
14 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
15
16The software is supplied "as is", without warranty of any kind,
17express or implied, including, without limitation, the warranties
18of merchantability, fitness for a particular purpose, title, and
19non-infringement.  In no event shall the Copyright owners, or
20anyone distributing the software, be liable for any damages or
21other liability, whether in contract, tort or otherwise, arising
22from, out of, or in connection with the software, or the use or
23other dealings in the software, even if advised of the possibility
24of such damage.
25
26Permission is hereby granted to use, copy, modify, and distribute
27this software, or portions hereof, for any purpose, without fee,
28subject to the following restrictions:
29
30 1. The origin of this software must not be misrepresented; you
31    must not claim that you wrote the original software.  If you
32    use this software in a product, an acknowledgment in the product
33    documentation would be appreciated, but is not required.
34
35 2. Altered source versions must be plainly marked as such, and must
36    not be misrepresented as being the original software.
37
38 3. This Copyright notice may not be removed or altered from any
39    source or altered source distribution.
40
41
42PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
43-----------------------------------------------------------------------
44
45libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are
46Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
47derived from libpng-1.0.6, and are distributed according to the same
48disclaimer and license as libpng-1.0.6 with the following individuals
49added to the list of Contributing Authors:
50
51    Simon-Pierre Cadieux
52    Eric S. Raymond
53    Mans Rullgard
54    Cosmin Truta
55    Gilles Vollant
56    James Yu
57    Mandar Sahastrabuddhe
58    Google Inc.
59    Vadim Barkov
60
61and with the following additions to the disclaimer:
62
63    There is no warranty against interference with your enjoyment of
64    the library or against infringement.  There is no warranty that our
65    efforts or the library will fulfill any of your particular purposes
66    or needs.  This library is provided with all faults, and the entire
67    risk of satisfactory quality, performance, accuracy, and effort is
68    with the user.
69
70Some files in the "contrib" directory and some configure-generated
71files that are distributed with libpng have other copyright owners, and
72are released under other open source licenses.
73
74libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
75Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
76libpng-0.96, and are distributed according to the same disclaimer and
77license as libpng-0.96, with the following individuals added to the
78list of Contributing Authors:
79
80    Tom Lane
81    Glenn Randers-Pehrson
82    Willem van Schaik
83
84libpng versions 0.89, June 1996, through 0.96, May 1997, are
85Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
86and are distributed according to the same disclaimer and license as
87libpng-0.88, with the following individuals added to the list of
88Contributing Authors:
89
90    John Bowler
91    Kevin Bracey
92    Sam Bushell
93    Magnus Holmgren
94    Greg Roelofs
95    Tom Tanner
96
97Some files in the "scripts" directory have other copyright owners,
98but are released under this license.
99
100libpng versions 0.5, May 1995, through 0.88, January 1996, are
101Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
102
103For the purposes of this copyright and license, "Contributing Authors"
104is defined as the following set of individuals:
105
106    Andreas Dilger
107    Dave Martindale
108    Guy Eric Schalnat
109    Paul Schmidt
110    Tim Wegner
111
112The PNG Reference Library is supplied "AS IS".  The Contributing
113Authors and Group 42, Inc. disclaim all warranties, expressed or
114implied, including, without limitation, the warranties of
115merchantability and of fitness for any purpose.  The Contributing
116Authors and Group 42, Inc. assume no liability for direct, indirect,
117incidental, special, exemplary, or consequential damages, which may
118result from the use of the PNG Reference Library, even if advised of
119the possibility of such damage.
120
121Permission is hereby granted to use, copy, modify, and distribute this
122source code, or portions hereof, for any purpose, without fee, subject
123to the following restrictions:
124
125 1. The origin of this source code must not be misrepresented.
126
127 2. Altered versions must be plainly marked as such and must not
128    be misrepresented as being the original source.
129
130 3. This Copyright notice may not be removed or altered from any
131    source or altered source distribution.
132
133The Contributing Authors and Group 42, Inc. specifically permit,
134without fee, and encourage the use of this source code as a component
135to supporting the PNG file format in commercial products.  If you use
136this source code in a product, acknowledgment is not required but would
137be appreciated.
138