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Qt is available under different licensing options designed to accommodate the needs of our various users:
Qt contains also third-party code that is licensed under specific open-source licenses from the original authors.
Note: For open-source licensed Qt, some specific parts (modules) are not available under the GNU LGPL version 3, but under the GNU General Public License (GPL) instead. See the list of Qt modules for details. For commercial licensees, all modules are available under a single, commercial Qt license.
Qt documentation is licensed under the terms of the GNU Free Documentation License (FDL) version 1.3, as published by the Free Software Foundation. Alternatively, you may use the documentation in accordance with the terms contained in a written agreement between you and The Qt Company.
See http://qt.io/licensing/ for an overview of Qt licensing.
To purchase a Qt license, visit http://www.qt.io/download/.
For further information and assistance about Qt licensing, contact our sales; see http://www.qt.io/locations/ for contact details.
The following page documents the open-source licenses used in different parts of Qt:
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