Licenses Used in Qt
Qt contains some code that is not provided under the GNU Lesser General Public License (LGPL) or the Qt Commercial License, but rather under specific licenses from the original authors.
The Qt Company gratefully acknowledges these and other contributions to Qt. We recommend that programs that use Qt also acknowledge these contributions, and quote these license statements in an appendix to the documentation.
Note: You only need to comply with (and acknowledge) the licenses of the third-party components that you are using with your application. Click the name of the component to see the licensing details.
Third-party Licenses
The following table lists parts (modules) of Qt that incorporate code licensed under third-party open-source licenses:
Qt Core
ZLib license | |
BSD 3-clause "New" or "Revised" License | |
Efficient Binary-Decimal and Decimal-Binary Conversion Routines for IEEE Doubles | BSD 3-clause "New" or "Revised" License |
BSD 3-clause "New" or "Revised" License | |
Public Domain | |
Public Domain | |
BSD 3-clause "New" or "Revised" License | |
BSD 3-clause "New" or "Revised" License | |
BSD 3-clause "New" or "Revised" License | |
Public Domain | |
Creative Commons Zero v1.0 Universal | |
BSD 3-clause "New" or "Revised" License | |
BSD 3-clause "New" or "Revised" License | |
BSD 2-clause "Simplified" License | |
BSD 2-clause "Simplified" License | |
BSD 2-clause "Simplified" License | |
BSD 2-clause "Simplified" License | |
BSD 2-clause "Simplified" License | |
BSD 2-clause "Simplified" License | |
BSD 2-clause "Simplified" License | |
Mozilla Public License 2.0 | |
Unicode License Agreement - Data Files and Software (2016) | |
Unicode License Agreement - Data Files and Software (2016) | |
MIT License |
Qt GUI
BSD 3-clause "New" or "Revised" License | |
BSD 2-clause "Simplified" License | |
Public Domain | |
BSD 2-clause "Simplified" License | |
BSD 3-clause "New" or "Revised" License | |
BSD 3-clause "New" or "Revised" License | |
Freetype Project License or GNU General Public License v2.0 only | |
MIT License | |
MIT License | |
Zlib License | |
MIT License | |
MIT License | |
BSD 3-clause "New" or "Revised" License | |
Independent JPEG Group License | |
Libpng License | |
Apache License 2.0 | |
MIT License | |
MIT License | |
MIT License | |
Freetype Project License or GNU General Public License v2.0 only | |
Freetype Project License or GNU General Public License v2.0 only | |
Public Domain | |
MIT License | |
MIT Licenses (with no-advertisement clause) |
Qt SQL
Public Domain |
Qt Test
MIT License | |
GNU General Public License v2.0 only | |
BSD 4-clause "Original" or "Old" License |
Additional Information
The following table lists related documents, such as information about Trademarks and other licenses used in parts of Qt.
Provides additional information about the licensing of run-time dependencies of Qt for Android | |
License information for contributions by Apple, Inc. to specific parts of the Qt for macOS Cocoa port. | |
BSD 3-clause "New" or "Revised" License | |
MIT License | |
Details of restrictions on the use of PDF-related trademarks | |
Information about open source licensing of Qt. | |
Commercial and BSD 3-clause "New" or "Revised" License. | |
Information about trademarks owned by The Qt Company and other organizations. |