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 3D
BSD 3-clause "New" or "Revised" Licensee |
Qt Bluetooth
GNU General Public License v2.0 only |
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 Data Files and Software License | |
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 | |
Freetype Project License or GNU General Public License v2.0 only | |
BSD 3-clause "New" or "Revised" License | |
Freetype Project License or GNU General Public License v2.0 only | |
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 | |
BSD 2-clause "Simplified" License and Imlib2 License | |
Public Domain | |
MIT License | |
GNU Library General Public License v2 or later | |
MIT Licenses (with no-advertisement clause) |
Qt Help
GNU Lesser General Public License v2.1 only or Apache License, Version 2.0 |
Qt Image Formats
JasPer License | |
zlib License | |
libtiff License | |
BSD 3-clause "New" or "Revised" License |
Qt Location
MIT License | |
Boost Software License 1.0 | |
BSD 3-clause "New" or "Revised" License |
Qt QML
BSD 2-clause "Simplified" License |
Qt SQL
Public Domain |
Qt SVG
MIT "Old Style" License |
Qt Script
GNU Library General Public License v2 or later |
Qt Test
MIT License | |
GNU General Public License v2.0 only | |
BSD 4-clause "Original" or "Old" License |
Qt Virtual Keyboard
MIT License | |
Apache License 2.0 | |
Apache License 2.0 | |
Apache License 2.0 and BSD 3-clause "New" or "Revised" License |
Qt Wayland Compositor
MIT License | |
HPND License | |
HPND License | |
MIT License |
Qt WebEngine
BSD | |
Apache 2.0 | |
Apache 2.0 | |
BSL (v 1.0) | |
MIT | |
Apache 2.0 | |
Apache 2.0 | |
BSD | |
BSD | |
Apache 2.0 | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
Apache 2.0 | |
Apache 2.0 | |
Apple Public Source License 2.0 | |
MIT-like | |
Apache 2.0 | |
MIT | |
Apache 2.0 | |
MIT | |
Custom license "inspired by the BSD, Artistic, and IJG (Independent | |
Apache License 2.0 | |
Apache 2.0 | |
Google fork of Khronos reference front-end for GLSL and ESSL | MIT |
Apache 2.0 | |
Apache 2.0, LGPL 2.1 | |
BSD | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
MIT/X11, SGI Free Software License B | |
Public Domain | |
Apache 2.0 | |
New BSD | |
BSD | |
MIT | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
MPL 2 | |
BSD | |
2-Clause BSD | |
BSD | |
BSD | |
BSD | |
BSD | |
BSD | |
MIT | |
MIT, Public Domain | |
MIT | |
Apache 2.0 | |
BSD | |
New BSD | |
BSD | |
University of Illinois/NCSA Open Source License | |
Proprietary | |
BSD | |
Apache 2.0 | |
BSD | |
MIT | |
LGPL 2.1 | |
Apache 2.0 | |
BSD and LGPL v2 and LGPL v2.1 | |
BSD | |
BSD | |
BSD | |
Microsoft Permissive License | |
Apache Version 2.0 and SIL Open Font License, Version 1.1 | |
BSDish | |
BSD Protection license | |
NOT_SHIPPED | |
BSD 3-Clause | |
BSD | |
BSD | |
Freely Distributable | |
LGPL 2.1 | |
BSD 3-Clause | |
BSD | |
MIT | |
BSD-style, copyright Google | |
BSD | |
Apache 2.0 | |
MIT | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
Custom license | |
MIT | |
MIT | |
University of Illinois/NCSA Open Source | |
MIT, University of Illinois/NCSA Open Source License | |
MIT, University of Illinois/NCSA Open Source License | |
BSD | |
BSD | |
Custom license | |
Custom license | |
libpng license | |
LGPL 2.1 | |
3-clause BSD | |
LGPL 2.1 | |
LGPL 2.1 | |
MIT | |
BSD | |
MIT | |
MIT | |
BSD | |
BSD | |
MIT and 2-clause BSD | |
MIT and LGPL v2 | |
BSD | |
BSD | |
BSD | |
Apache 2.0, MIT, GPL v2 and custom licenses | |
BSD | |
BSD 3-Clause | |
Apache 2.0 | |
MIT | |
Public domain | |
BSD | |
Public domain and BSD | |
BSD and MPL 1.1/GPL 2.0/LGPL 2.1 | |
New BSD | |
LGPL 2.1 | |
BSD | |
MIT | |
MIT | |
Apache 2.0 | |
ISC from text in file header. Same text is copied to LICENSE file. | |
Academic Free License version 2.0 or LGPL v2 | |
MIT | |
MIT | |
2-clause or 3-clause BSD licensed, with the exception of bitvect, which is triple-licensed under the Artistic license, GPL, and LGPL | |
Custom 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. | |
Information about the licenses of fonts supplied with Qt | |
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. |
© 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.