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THIS IS THE OPEN SOURCE VERSION OF Qt, RELEASED UNDER THE GPL
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LICENSE. PLEASE READ THIS FILE TO FIND OUT WHAT THAT MEANS TO YOU.
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Qt is licensed under two licenses: the GNU General Public License
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(GPL) and a commercial license. You are currently using the Open
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Source (GPL) version of Qt. This file explains the principle of dual
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licensing, and which obligations using the GPL version of Qt implies.
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Please note that it is necessary to choose either the Open Source or
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Commercial license at the outset of development. Trolltech's
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commercial license terms do not allow you to start developing
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proprietary software using the Open Source edition.
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Dual Licensing is based on the principle of Quid Pro Quo - something
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for something. If you, your company or your organization derive
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commercial benefit from Trolltech's products and do not wish to
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release your complete source code, you are required to purchase the
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appropriate number of commercial licenses.
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Alternatively, if you are willing to follow the terms of the GPL
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(General Public License), Trolltech software is available to you under
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Open Source licenses which allows you to develop, modify and
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distribute your software freely. If you wish to use an open source
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version of Trolltech's products, you must contribute all your source
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code to the open source community, according to the terms of the
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applicable open source license.
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By offering both open source and commercial licenses, Trolltech
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ensures the availability of resources for ongoing development and
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improvement of Qt. By purchasing commercial licenses, you are no
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longer obligated to publish your source code.
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COMMERCIAL AND OPEN SOURCE LICENSES
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===================================
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Trolltech's Commercial licenses allow customers to develop, use and
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distribute their applications under standard commercial terms.
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Trolltech's Open Source versions are available under the terms of the
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GPL - General Public License. The main obligation for software
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development under the GPL is that anyone using your Qt-based software
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must have access to the complete source code, and must be able to
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modify and redistribute that software to anyone free of charge.
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You can find additional information about dual licensing at the
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Qt Open Source Edition License FAQ:
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http://www.trolltech.com/developer/faqs/license_gpl.html
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Qt Commercial Licensing Page:
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http://www.trolltech.com/products/qt/licensing.html
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Qt Open Source Licensing Page:
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http://www.trolltech.com/products/qt/opensource.html
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Please contact sales@trolltech.com with any additional questions about