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# E.4 Contributions

XTrackCAD incorporates the following software:

    This program uses FreeImage, a free, open source image library supporting all common bitmap formats.
    See http://freeimage.sourceforge.net for details

    uthash, utlist
    Copyright (c) 2005-2015, Troy D. Hanson  http://troydhanson.github.com/uthash/
    All rights reserved.

    CJson - https://github.com/DaveGamble/cJSON/blob/master/README.md#license
    Copyright (c) 2009-2017 Dave Gamble and cJSON contributors

    zlib - https://opensource.org/licenses/zlib-license.php

    libzip - https://libzip.org/license/
    Copyright (C) 1999-2019 Dieter Baron and Thomas Klausner

    The authors can be contacted at <libzip@nih.at>

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

    THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.

    minixml - https://github.com/michaelrsweet/mxml/commit/f166ad1977f2f13295689772a5d9e442f73d46f1

    Copyright (C) 2003-2019 by Michael R Sweet.
    The Mini-XML library is licensed under the Apache License Version 2.0 with an
    exception to allow linking against GPL2/LGPL2-only software.