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PyQt GPL exception
Riverbank GPL Exception version 1.1
Additional rights granted beyond the GPL (the "Exception").
As a special exception to the terms and conditions of version 2.0 of the GPL,
Riverbank hereby grants you the rights described below, provided you agree to
the terms and conditions in this Exception, including its obligations and
restrictions on use.
Nothing in this Exception gives you or anyone else the right to change the
licensing terms of the PyQt Open Source Edition.
Below, "Licensed Software" shall refer to the software licensed under the GPL
and this exception.
1) The right to use Open Source Licenses not compatible with the GNU
General Public License: Your software (hereafter referred to as "Your
Software") may import the Licensed Software and/or distribute binaries of Your
Software that imports the Licensed Software, provided that:
A) Your Software is licensed under one of the following licenses:
License name Version(s)/Copyright Date
Academic Free License 2.0, 2.1, 3.0
Apache Software License 1.0 or 1.1
Apache License 2.0
Apple Public Source License 2.0
Artistic license From Perl 5.8.0
BSD license "July 22 1999"
Common Development and
Distribution License (CDDL) 1.0
Common Public License 1.0
Eclipse Public License 1.0
GNU Library or "Lesser"
General Public License (LGPL) 2.0 or 2.1
Jabber Open Source License 1.0
MIT License (as set forth in the addendum file)
Mozilla Public License (MPL) 1.0 or 1.1
Open Software License 2.0, 3.0
OpenSSL license (with original
SSLeay license) "2003" ("1998")
PHP License 3.0
Python license (CNRI Python License) (as set forth in the addendum file)
Python Software Foundation License 2.1.1
Q Public License v1.0
Sleepycat License "1999"
W3C License "2001"
X11 License X11R6.6
Zlib/libpng License (as set forth in the addendum file)
Zope Public License 2.0, 2.1
(Licenses without a specific version number or date are reproduced
in the file GPL_Exception_Addendum.txt in your source package).
B) You must, on request, make a complete package including
the complete source code of Your Software (as defined
in the GNU General Public License version 2, section 3,
but excluding anything excluded by the special
exception in the same section) available to Riverbank
under the same license as that granted to other
recipients of the source code of Your Software.
C) Your or any other contributor's rights to:
i) distribute the source code of Your Software to anyone for
any purpose;
ii) publicly discuss the development project for Your
Software and its goals in any form and in any forum
are not prohibited by any legal instrument, including but not limited to
contracts, non-disclosure agreements, and employee contracts.
2) The right to link non-Open Source applications with pre-installed versions of
the Licensed Software: You may link applications with binary pre-installed
versions of the Licensed Software, provided that such applications have been
developed and are deployed in accordance with the terms and conditions of the
PyQt Commercial License Agreement.

This was extracted from a PyQt source tarball, PyQt-x11-gpl-4.11.1.tar.gz, downloaded 2014-07-12 from the Riverbank download page.

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