Syncplay relies on the following softwares, in compliance with their licenses. 

PySide

Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
Contact: PySide team <contact@pyside.org>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>

Twisted

Copyright (c) 2001-2017
Allen Short
Amber Hawkie Brown
Andrew Bennetts
Andy Gayton
Antoine Pitrou
Apple Computer, Inc.
Ashwini Oruganti
Benjamin Bruheim
Bob Ippolito
Canonical Limited
Christopher Armstrong
David Reid
Divmod Inc.
Donovan Preston
Eric Mangold
Eyal Lotem
Google Inc.
Hybrid Logic Ltd.
Hynek Schlawack
Itamar Turner-Trauring
James Knight
Jason A. Mobarak
Jean-Paul Calderone
Jessica McKellar
Jonathan D. Simms
Jonathan Jacobs
Jonathan Lange
Julian Berman
Jürgen Hermann
Kevin Horn
Kevin Turner
Laurens Van Houtven
Mary Gardiner
Massachusetts Institute of Technology
Matthew Lefkowitz
Moshe Zadka
Paul Swartz
Pavel Pergamenshchik
Rackspace, US Inc.
Ralph Meijer
Richard Wall
Sean Riley
Software Freedom Conservancy
Tavendo GmbH
Thijs Triemstra
Thomas Herve
Timothy Allen
Tom Prince
Travis B. Hartwell

and others that have contributed code to the public domain.

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.

Qt 4

Copyright (C) 2015 The Qt Company Ltd.
Contact: http://www.qt.io/licensing/

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>

appnope

Copyright (c) 2013, Min Ragan-Kelley

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.

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.

PyObjC

Copyright 2002, 2003 - Bill Bumgarner, Ronald Oussoren, Steve Majewski, Lele Gaifax, et.al.
Copyright 2003-2016 - Ronald Oussoren

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.

py2exe

Copyright (c) 2000-2013 Thomas Heller, Jimmy Retzlaff

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.

py2app

Copyright (c) 2004 Bob Ippolito.

Some parts copyright (c) 2010-2014 Ronald Oussoren

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.

dmgbuild

Copyright (c) 2014 Alastair Houghton
Copyright (c) 2017 The Qt Company Ltd.

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.