Qt can be used to develop closed source software if you obtain a commercial license.
If you want to develop Free or Open Source software for release using a recognized Open Source license, you can use the Open Source Versions of Qt.
The following table is a summary of the licenses under which Qt is made available.
| Qt Commercial Developer License | The Qt Commercial Developer License is the appropriate version to use for the development of proprietary and/or commercial software where the developer does not wish to share or distribute any source code of the Qt libraries or otherwise comply with the terms of the GNU Lesser General Public License version 2.1 or GNU GPL version 3.0. |
| Qt GNU LGPL v. 2.1 | This version of Qt is appropriate for the development of Qt applications (proprietary or open source) provided you can comply with the terms and conditions contained in the GNU LGPL version 2.1. |
| Qt GNU GPL v. 3.0 | This version of Qt is appropriate for the development of Qt applications where you wish to use such applications in combination with software subject to the terms of the GNU General Public License version 3.0 or where you are otherwise willing to comply with the terms of the GNU General Public License version 3.0. |
Please see the list of supported platforms for up-to-date information about the various platforms and compilers that Qt supports.
On the Qt Web site, you can find a Qt Licensing Overview and information on Qt License Pricing for commercial editions of Qt and other Qt-related products.
To purchase, please visit the online order form.
For further information and assistance, please contact the Qt sales team via one of the following channels:
| Web: | http://qt.nokia.com/contact |
| Phone, U.S. office (for sales in North America): | 1-408-220-9020 |
| Phone, Norway office (for sales in the rest of the world): | +47 21 60 48 00 |
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Licensees holding valid Qt Commercial licenses may use this document in accordance with the Qt Commercial License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Nokia.
Alternatively, this document may be used under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.