Qt Licensing

Qt is available under three different licensing options designed to accommodate the needs of our various users.

Qt licensed under our commercial license agreement is appropriate for development of proprietary/commercial software where you do not want to share any source code with third parties or otherwise cannot comply with the terms of the GNU LGPL version 2.1 or GNU GPL version 3.0.

Qt licensed under the GNU Lesser General Public License (LGPL) version 2.1 is appropriate for the development of Qt applications provided you can comply with the terms and conditions of the GNU LGPL version 2.1.

Qt licensed under the GNU General Public License (GPL) version 3.0 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 GPL version 3.0 or where you are otherwise willing to comply with the terms of the GNU GPL version 3.0.

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 Digia.

Please see http://qt.digia.com/licensing for an overview of Qt licensing.

Purchasing and Sales Information

To purchase or further information and assistance about Qt commercial licensing, please contact Digia Qt sales via one of the following channels:

Web:http://qt.digia.com/contact-us
Phone, U.S. office (for sales in North America):+1 408 433 9320
Phone, Norway office (for sales in the rest of the world):+47 2108 0420

Additional information

The documents below list related documents, such as information about Trademark and other licenses used in parts of Qt.

Qt Designer License Information

License information for contributions to specific parts of the Qt Designer source code.

Notes about PDF Licensing

Details of restrictions on the use of PDF-related trademarks.

Qt SVG License Information

License information for Qt SVG

Third-Party Licenses Used in Qt

License information for third-party libraries supplied with Qt.

Android GNU C++ Run-time Licensing

Provides additional information about the licensing of run-time dependencies of Qt for Android

Licenses for Fonts Used in Qt for Embedded Linux

Information about the licenses of fonts supplied with Qt

Other Licenses Used in Qt

Information about other licenses used for Qt components and third-party code.

Open Source Licensing of Qt

Information about open source licensing of Qt.

Trademarks

Information about trademarks owned by Digia and other organisations.

The qtmain Library

Describes the use and license of the qtmain helper library.

Contributions to the Cocoa Platform Plugin Files

License information for contributions by Apple, Inc. to specific parts of the Qt for Mac OS X Cocoa port.