LICENSE

Valve, the Valve logo, Half-Life, the Half-Life logo, the Lambda logo, Steam,
the Steam logo, Team Fortress, the Team Fortress logo, Opposing Force, Day of
Defeat, the Day of Defeat logo, Counter-Strike, the Counter-Strike logo, Source,
the Source logo, Counter-Strike: Condition Zero, Portal, the Portal logo, Dota,
the Dota 2 logo, and Defense of the Ancients are trademarks and/or registered
trademarks of Valve Corporation. All other trademarks are property of their
respective owners. See https://store.steampowered.com/legal for Valve Corporation legal details.

The Source 1 license applies to all parts of repository that are not explicitly
marked with other licenses or externally maintained libraries.

"""
     SOURCE 1 SDK LICENSE

  Source SDK Copyright(c) Valve Corp.  

  THIS DOCUMENT DESCRIBES A CONTRACT BETWEEN YOU AND VALVE 
  CORPORATION ("Valve").  PLEASE READ IT BEFORE DOWNLOADING OR USING 
  THE SOURCE ENGINE SDK ("SDK"). BY DOWNLOADING AND/OR USING THE 
  SOURCE ENGINE SDK YOU ACCEPT THIS LICENSE. IF YOU DO NOT AGREE TO 
  THE TERMS OF THIS LICENSE PLEASE DON’T DOWNLOAD OR USE THE SDK.  

  You may, free of charge, download and use the SDK to develop a modified Valve game 
  running on the Source engine.  You may distribute your modified Valve game in source and 
  object code form, but only for free. Terms of use for Valve games are found in the Steam 
  Subscriber Agreement located here: https://store.steampowered.com/subscriber_agreement/

  You may copy, modify, and distribute the SDK and any modifications you make to the 
  SDK in source and object code form, but only for free.  Any distribution of this SDK must 
  include this LICENSE file and thirdpartylegalnotices.txt.  

  Any distribution of the SDK or a substantial portion of the SDK must include the above 
  copyright notice and the following: 

      DISCLAIMER OF WARRANTIES.  THE SOURCE SDK AND ANY 
      OTHER MATERIAL DOWNLOADED BY LICENSEE IS PROVIDED 
      "AS IS".  VALVE AND ITS SUPPLIERS DISCLAIM ALL 
      WARRANTIES WITH RESPECT TO THE SDK, EITHER EXPRESS 
      OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED 
      WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, 
      TITLE AND FITNESS FOR A PARTICULAR PURPOSE.  

      LIMITATION OF LIABILITY.  IN NO EVENT SHALL VALVE OR 
      ITS SUPPLIERS BE LIABLE FOR ANY SPECIAL, INCIDENTAL, 
      INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER 
      (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF 
      BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF 
      BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS) 
      ARISING OUT OF THE USE OF OR INABILITY TO USE THE 
      ENGINE AND/OR THE SDK, EVEN IF VALVE HAS BEEN 
      ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.  

  If you would like to use the SDK for a commercial purpose, please contact Valve at 
  sourceengine@valvesoftware.com.
"""

Externally maintained by Source 1 libraries are:

- bzip2 located at thirdparty\bzip2 is licensed as:
"""
  This program, "bzip2", the associated library "libbzip2", and all
  documentation, are copyright (C) 1996-2019 Julian R Seward.  All
  rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. 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.

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

  4. The name of the author may not be used to endorse or promote 
     products derived from this software without specific prior written 
     permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  Julian Seward, jseward@acm.org
  bzip2/libbzip2 version 1.0.8 of 13 July 2019
"""

- DirectXMath located at thirdparty\DirectXMath is licensed as:
"""
  The MIT License (MIT)

  Copyright (c) 2011-2022 Microsoft Corp

  Permission is hereby granted, free of charge, to any person obtaining a copy of this 
  software and associated documentation files (the "Software"), to deal in the Software 
  without restriction, including without limitation the rights to use, copy, modify, 
  merge, publish, distribute, sublicense, and/or sell copies of the Software, and to 
  permit persons to whom the Software is furnished to do so, subject to the following 
  conditions: 

  The above copyright notice and this permission notice shall be included in all copies 
  or substantial portions of the Software.  

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 
  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
  OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""

- libjpeg-turbo located at thirdparty\libjpeg-turbo is licensed as:
"""
  libjpeg-turbo Licenses
  ======================

  libjpeg-turbo is covered by three compatible BSD-style open source licenses:

  - The IJG (Independent JPEG Group) License, which is listed below

    libjpeg-turbo note:  This file has been modified by The libjpeg-turbo Project
    to include only information relevant to libjpeg-turbo, to wordsmith certain
    sections, and to remove impolitic language that existed in the libjpeg v8
    README.  It is included only for reference.  Please see README.md for
    information specific to libjpeg-turbo.


    The Independent JPEG Group's JPEG software
    ==========================================

    This distribution contains a release of the Independent JPEG Group's free JPEG
    software.  You are welcome to redistribute this software and to use it for any
    purpose, subject to the conditions under LEGAL ISSUES, below.

    This software is the work of Tom Lane, Guido Vollbeding, Philip Gladstone,
    Bill Allombert, Jim Boucher, Lee Crocker, Bob Friesenhahn, Ben Jackson,
    Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge' Weijers,
    and other members of the Independent JPEG Group.

    IJG is not affiliated with the ISO/IEC JTC1/SC29/WG1 standards committee
    (also known as JPEG, together with ITU-T SG16).


    DOCUMENTATION ROADMAP
    =====================

    This file contains the following sections:

    OVERVIEW            General description of JPEG and the IJG software.
    LEGAL ISSUES        Copyright, lack of warranty, terms of distribution.
    REFERENCES          Where to learn more about JPEG.
    ARCHIVE LOCATIONS   Where to find newer versions of this software.
    FILE FORMAT WARS    Software *not* to get.
    TO DO               Plans for future IJG releases.

    Other documentation files in the distribution are:

    User documentation:
      usage.txt         Usage instructions for cjpeg, djpeg, jpegtran,
                        rdjpgcom, and wrjpgcom.
      *.1               Unix-style man pages for programs (same info as usage.txt).
      wizard.txt        Advanced usage instructions for JPEG wizards only.
      change.log        Version-to-version change highlights.
    Programmer and internal documentation:
      libjpeg.txt       How to use the JPEG library in your own programs.
      example.txt       Sample code for calling the JPEG library.
      structure.txt     Overview of the JPEG library's internal structure.
      coderules.txt     Coding style rules --- please read if you contribute code.

    Please read at least usage.txt.  Some information can also be found in the JPEG
    FAQ (Frequently Asked Questions) article.  See ARCHIVE LOCATIONS below to find
    out where to obtain the FAQ article.

    If you want to understand how the JPEG code works, we suggest reading one or
    more of the REFERENCES, then looking at the documentation files (in roughly
    the order listed) before diving into the code.


    OVERVIEW
    ========

    This package contains C software to implement JPEG image encoding, decoding,
    and transcoding.  JPEG (pronounced "jay-peg") is a standardized compression
    method for full-color and grayscale images.  JPEG's strong suit is compressing
    photographic images or other types of images that have smooth color and
    brightness transitions between neighboring pixels.  Images with sharp lines or
    other abrupt features may not compress well with JPEG, and a higher JPEG
    quality may have to be used to avoid visible compression artifacts with such
    images.

    JPEG is lossy, meaning that the output pixels are not necessarily identical to
    the input pixels.  However, on photographic content and other "smooth" images,
    very good compression ratios can be obtained with no visible compression
    artifacts, and extremely high compression ratios are possible if you are
    willing to sacrifice image quality (by reducing the "quality" setting in the
    compressor.)

    This software implements JPEG baseline, extended-sequential, and progressive
    compression processes.  Provision is made for supporting all variants of these
    processes, although some uncommon parameter settings aren't implemented yet.
    We have made no provision for supporting the hierarchical or lossless
    processes defined in the standard.

    We provide a set of library routines for reading and writing JPEG image files,
    plus two sample applications "cjpeg" and "djpeg", which use the library to
    perform conversion between JPEG and some other popular image file formats.
    The library is intended to be reused in other applications.

    In order to support file conversion and viewing software, we have included
    considerable functionality beyond the bare JPEG coding/decoding capability;
    for example, the color quantization modules are not strictly part of JPEG
    decoding, but they are essential for output to colormapped file formats or
    colormapped displays.  These extra functions can be compiled out of the
    library if not required for a particular application.

    We have also included "jpegtran", a utility for lossless transcoding between
    different JPEG processes, and "rdjpgcom" and "wrjpgcom", two simple
    applications for inserting and extracting textual comments in JFIF files.

    The emphasis in designing this software has been on achieving portability and
    flexibility, while also making it fast enough to be useful.  In particular,
    the software is not intended to be read as a tutorial on JPEG.  (See the
    REFERENCES section for introductory material.)  Rather, it is intended to
    be reliable, portable, industrial-strength code.  We do not claim to have
    achieved that goal in every aspect of the software, but we strive for it.

    We welcome the use of this software as a component of commercial products.
    No royalty is required, but we do ask for an acknowledgement in product
    documentation, as described under LEGAL ISSUES.


    LEGAL ISSUES
    ============

    In plain English:

    1. We don't promise that this software works.  (But if you find any bugs,
       please let us know!)
    2. You can use this software for whatever you want.  You don't have to pay us.
    3. You may not pretend that you wrote this software.  If you use it in a
       program, you must acknowledge somewhere in your documentation that
       you've used the IJG code.

    In legalese:

    The authors make NO WARRANTY or representation, either express or implied,
    with respect to this software, its quality, accuracy, merchantability, or
    fitness for a particular purpose.  This software is provided "AS IS", and you,
    its user, assume the entire risk as to its quality and accuracy.

    This software is copyright (C) 1991-2020, Thomas G. Lane, Guido Vollbeding.
    All Rights Reserved except as specified below.

    Permission is hereby granted to use, copy, modify, and distribute this
    software (or portions thereof) for any purpose, without fee, subject to these
    conditions:
    (1) If any part of the source code for this software is distributed, then this
    README file must be included, with this copyright and no-warranty notice
    unaltered; and any additions, deletions, or changes to the original files
    must be clearly indicated in accompanying documentation.
    (2) If only executable code is distributed, then the accompanying
    documentation must state that "this software is based in part on the work of
    the Independent JPEG Group".
    (3) Permission for use of this software is granted only if the user accepts
    full responsibility for any undesirable consequences; the authors accept
    NO LIABILITY for damages of any kind.

    These conditions apply to any software derived from or based on the IJG code,
    not just to the unmodified library.  If you use our work, you ought to
    acknowledge us.

    Permission is NOT granted for the use of any IJG author's name or company name
    in advertising or publicity relating to this software or products derived from
    it.  This software may be referred to only as "the Independent JPEG Group's
    software".

    We specifically permit and encourage the use of this software as the basis of
    commercial products, provided that all warranty or liability claims are
    assumed by the product vendor.


    REFERENCES
    ==========

    We recommend reading one or more of these references before trying to
    understand the innards of the JPEG software.

    The best short technical introduction to the JPEG compression algorithm is
            Wallace, Gregory K.  "The JPEG Still Picture Compression Standard",
            Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
    (Adjacent articles in that issue discuss MPEG motion picture compression,
    applications of JPEG, and related topics.)  If you don't have the CACM issue
    handy, a PDF file containing a revised version of Wallace's article is
    available at http://www.ijg.org/files/Wallace.JPEG.pdf.  The file (actually
    a preprint for an article that appeared in IEEE Trans. Consumer Electronics)
    omits the sample images that appeared in CACM, but it includes corrections
    and some added material.  Note: the Wallace article is copyright ACM and IEEE,
    and it may not be used for commercial purposes.

    A somewhat less technical, more leisurely introduction to JPEG can be found in
    "The Data Compression Book" by Mark Nelson and Jean-loup Gailly, published by
    M&T Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1.  This book provides
    good explanations and example C code for a multitude of compression methods
    including JPEG.  It is an excellent source if you are comfortable reading C
    code but don't know much about data compression in general.  The book's JPEG
    sample code is far from industrial-strength, but when you are ready to look
    at a full implementation, you've got one here...

    The best currently available description of JPEG is the textbook "JPEG Still
    Image Data Compression Standard" by William B. Pennebaker and Joan L.
    Mitchell, published by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1.
    Price US$59.95, 638 pp.  The book includes the complete text of the ISO JPEG
    standards (DIS 10918-1 and draft DIS 10918-2).

    The original JPEG standard is divided into two parts, Part 1 being the actual
    specification, while Part 2 covers compliance testing methods.  Part 1 is
    titled "Digital Compression and Coding of Continuous-tone Still Images,
    Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
    10918-1, ITU-T T.81.  Part 2 is titled "Digital Compression and Coding of
    Continuous-tone Still Images, Part 2: Compliance testing" and has document
    numbers ISO/IEC IS 10918-2, ITU-T T.83.

    The JPEG standard does not specify all details of an interchangeable file
    format.  For the omitted details, we follow the "JFIF" conventions, revision
    1.02.  JFIF version 1 has been adopted as ISO/IEC 10918-5 (05/2013) and
    Recommendation ITU-T T.871 (05/2011): Information technology - Digital
    compression and coding of continuous-tone still images: JPEG File Interchange
    Format (JFIF).  It is available as a free download in PDF file format from
    https://www.iso.org/standard/54989.html and http://www.itu.int/rec/T-REC-T.871.
    A PDF file of the older JFIF 1.02 specification is available at
    http://www.w3.org/Graphics/JPEG/jfif3.pdf.

    The TIFF 6.0 file format specification can be obtained from
    http://mirrors.ctan.org/graphics/tiff/TIFF6.ps.gz.  The JPEG incorporation
    scheme found in the TIFF 6.0 spec of 3-June-92 has a number of serious
    problems.  IJG does not recommend use of the TIFF 6.0 design (TIFF Compression
    tag 6).  Instead, we recommend the JPEG design proposed by TIFF Technical Note
    #2 (Compression tag 7).  Copies of this Note can be obtained from
    http://www.ijg.org/files/.  It is expected that the next revision
    of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
    Although IJG's own code does not support TIFF/JPEG, the free libtiff library
    uses our library to implement TIFF/JPEG per the Note.


    ARCHIVE LOCATIONS
    =================

    The "official" archive site for this software is www.ijg.org.
    The most recent released version can always be found there in
    directory "files".

    The JPEG FAQ (Frequently Asked Questions) article is a source of some
    general information about JPEG.  It is available at
    http://www.faqs.org/faqs/jpeg-faq.


    FILE FORMAT COMPATIBILITY
    =========================

    This software implements ITU T.81 | ISO/IEC 10918 with some extensions from
    ITU T.871 | ISO/IEC 10918-5 (JPEG File Interchange Format-- see REFERENCES).
    Informally, the term "JPEG image" or "JPEG file" most often refers to JFIF or
    a subset thereof, but there are other formats containing the name "JPEG" that
    are incompatible with the DCT-based JPEG standard or with JFIF (for instance,
    JPEG 2000 and JPEG XR).  This software therefore does not support these
    formats.  Indeed, one of the original reasons for developing this free software
    was to help force convergence on a common, interoperable format standard for
    JPEG files.

    JFIF is a minimal or "low end" representation.  TIFF/JPEG (TIFF revision 6.0 as
    modified by TIFF Technical Note #2) can be used for "high end" applications
    that need to record a lot of additional data about an image.


    TO DO
    =====

    Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.

    This license applies to the libjpeg API library and associated programs
    (any code inherited from libjpeg, and any modifications to that code.)

  - The Modified (3-clause) BSD License, which is listed below

    This license covers the TurboJPEG API library and associated programs, as
    well as the build system.

  - The [zlib License](https://opensource.org/licenses/Zlib)

    This license is a subset of the other two, and it covers the libjpeg-turbo
    SIMD extensions.


  Complying with the libjpeg-turbo Licenses
  =========================================

  This section provides a roll-up of the libjpeg-turbo licensing terms, to the
  best of our understanding.

  1.  If you are distributing a modified version of the libjpeg-turbo source,
      then:

      1.  You cannot alter or remove any existing copyright or license notices
          from the source.

          **Origin**
          - Clause 1 of the IJG License
          - Clause 1 of the Modified BSD License
          - Clauses 1 and 3 of the zlib License

      2.  You must add your own copyright notice to the header of each source
          file you modified, so others can tell that you modified that file (if
          there is not an existing copyright header in that file, then you can
          simply add a notice stating that you modified the file.)

          **Origin**
          - Clause 1 of the IJG License
          - Clause 2 of the zlib License

      3.  You must include the IJG README file, and you must not alter any of the
          copyright or license text in that file.

          **Origin**
          - Clause 1 of the IJG License

  2.  If you are distributing only libjpeg-turbo binaries without the source, or
      if you are distributing an application that statically links with
      libjpeg-turbo, then:

      1.  Your product documentation must include a message stating:

          This software is based in part on the work of the Independent JPEG
          Group.

          **Origin**
          - Clause 2 of the IJG license

      2.  If your binary distribution includes or uses the TurboJPEG API, then
          your product documentation must include the text of the Modified BSD
          License (see below.)

          **Origin**
          - Clause 2 of the Modified BSD License

  3.  You cannot use the name of the IJG or The libjpeg-turbo Project or the
      contributors thereof in advertising, publicity, etc.

      **Origin**
      - IJG License
      - Clause 3 of the Modified BSD License

  4.  The IJG and The libjpeg-turbo Project do not warrant libjpeg-turbo to be
      free of defects, nor do we accept any liability for undesirable
      consequences resulting from your use of the software.

      **Origin**
      - IJG License
      - Modified BSD License
      - zlib License


  The Modified (3-clause) BSD License
  ===================================

  Copyright (C)2009-2022 D. R. Commander.  All Rights Reserved.<br>
  Copyright (C)2015 Viktor Szathmáry.  All Rights Reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
  - Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
  - Neither the name of the libjpeg-turbo Project nor the names of its
    contributors may be used to endorse or promote products derived from this
    software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.


  Why Three Licenses?
  ===================

  The zlib License could have been used instead of the Modified (3-clause) BSD
  License, and since the IJG License effectively subsumes the distribution
  conditions of the zlib License, this would have effectively placed
  libjpeg-turbo binary distributions under the IJG License.  However, the IJG
  License specifically refers to the Independent JPEG Group and does not extend
  attribution and endorsement protections to other entities.  Thus, it was
  desirable to choose a license that granted us the same protections for new code
  that were granted to the IJG for code derived from their software.
"""

- libpng located at thirdparty\libpng is licensed as:
"""
  COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
  =========================================

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

   * Copyright (c) 1995-2020 The PNG Reference Library Authors.
   * Copyright (c) 2018-2020 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.
"""

- Miles Sound System 7.1a located at thirdparty\mss is licensed as:
"""
  Author: John Miles

  Contact RAD Game Tools at 425-893-4300 for technical support.
"""

- MPAHeaderInfo 2.2 located at thirdparty\MPAHeaderInfo is licensed as:
"""
  GNU LESSER GENERAL PUBLIC LICENSE
  Version 3, 29 June 2007

  Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>

  Everyone is permitted to copy and distribute verbatim copies of this license
  document, but changing it is not allowed.

  This version of the GNU Lesser General Public License incorporates the terms and
  conditions of version 3 of the GNU General Public License, supplemented by the
  additional permissions listed below.
"""

- openvr 0.9.11 located at thirdparty\openvr is licensed as:
"""
  Copyright (c) 2015, Valve Corporation
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation and/or
  other materials provided with the distribution.

  3. Neither the name of the copyright holder nor the names of its contributors
  may be used to endorse or promote products derived from this software without
  specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""

- protobuf 2.6.1 located at thirdparty\protobuf-2.6.1 is licensed as:
"""
  Copyright 2008, Google Inc.
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:

      * Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the following disclaimer
  in the documentation and/or other materials provided with the
  distribution.
      * Neither the name of Google Inc. nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  Code generated by the Protocol Buffer compiler is owned by the owner
  of the input file used when generating it.  This code is not
  standalone and requires a support library to be linked with it.  This
  support library is itself covered by the above license.
"""

- sdl2 located at thirdparty\sdl2 is licensed as:
"""
  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, 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 notice may not be removed or altered from any source distribution.
"""

- stb located at thirdparty\stb is licensed as:
"""
  This software is available under 2 licenses -- choose whichever you prefer.
  ------------------------------------------------------------------------------
  ALTERNATIVE A - MIT License
  Copyright (c) 2017 Sean Barrett
  Permission is hereby granted, free of charge, to any person obtaining a copy of
  this software and associated documentation files (the "Software"), to deal in
  the Software without restriction, including without limitation the rights to
  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  of the Software, and to permit persons to whom the Software is furnished to do
  so, subject to the following conditions:
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  ------------------------------------------------------------------------------
  ALTERNATIVE B - Public Domain (www.unlicense.org)
  This is free and unencumbered software released into the public domain.
  Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
  software, either in source code form or as a compiled binary, for any purpose,
  commercial or non-commercial, and by any means.
  In jurisdictions that recognize copyright laws, the author or authors of this
  software dedicate any and all copyright interest in the software to the public
  domain. We make this dedication for the benefit of the public at large and to
  the detriment of our heirs and successors. We intend this dedication to be an
  overt act of relinquishment in perpetuity of all present and future rights to
  this software under copyright law.
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""

- zlib located at thirdparty\zlib is licensed as:
"""
  (C) 1995-2017 Jean-loup Gailly and Mark Adler

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, 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 notice may not be removed or altered from any source distribution.

  Jean-loup Gailly        Mark Adler
  jloup@gzip.org          madler@alumni.caltech.edu

  If you use the zlib library in a product, we would appreciate *not* receiving
  lengthy legal documents to sign.  The sources are provided for free but without
  warranty of any kind.  The library has been entirely written by Jean-loup
  Gailly and Mark Adler; it does not include third-party code.

  If you redistribute modified sources, we would appreciate that you include in
  the file ChangeLog history information documenting your changes.  Please read
  the FAQ for more information on the distribution of modified source versions.
"""