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 (This does not force user code to be GPL'ed. For more info see details.) |
Qt Core
Zlib License | |
BSD 3-clause "New" or "Revised" License | |
Efficient Binary-Decimal and Decimal-Binary Conversion Routines for IEEE Doubles, version 3.1.1 | BSD 3-clause "New" or "Revised" License |
FreeBSD strtoll and strtoull, version 18b29f3fb8abee5d57ed8f4a44f806bec7e0eeff | BSD 3-clause "New" or "Revised" License |
Public Domain | |
Public Domain | |
BSD 2-clause "Simplified" License | |
BSD 3-clause "New" or "Revised" License | |
BSD 3-clause "New" or "Revised" License | |
Public Domain | |
Creative Commons Zero v1.0 Universal | |
BSD 2-clause "Simplified" 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 | |
MIT License | |
Unicode License Agreement - Data Files and Software (2016) | |
Unicode License Agreement - Data Files and Software (2016) | |
MIT License |
Qt D-Bus
Academic Free License v2.1, or GNU General Public License v2.0 or later |
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 | |
Bitstream Vera Font License | |
BSD 3-clause "New" or "Revised" License | |
Bitstream Vera Font License | |
MIT License | |
MIT License | |
Zlib 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 and libpng License 2 | |
Apache License 2.0 | |
MIT License | |
MIT License | |
MIT License | |
BSD 2-clause "Simplified" License and Imlib2 License | |
MIT License | |
MIT License | |
Custom License | |
MIT License | |
International Color Consortium License |
Qt Image Formats
Libtiff License | |
BSD 3-clause "New" or "Revised" License |
Qt Location
Boost Software License 1.0 | |
MIT License | |
MIT License | |
Boost Software License 1.0 | |
ISC License | |
ISC License | |
BSD 2-clause "Simplified" License | |
BSD 3-clause "New" or "Revised" License | |
MIT License | |
ISC License | |
MIT License | |
MIT License | |
ISC License | |
ISC License | |
ISC License | |
ISC License | |
MIT and UIUC (BSD-like) | |
MIT License | |
ISC License | |
BSD 2-clause "Simplified" License | |
ISC License | |
ISC License | |
MIT License | |
Boost Software License 1.0 | |
BSD 3-clause "New" or "Revised" License |
Qt Purchasing
Apache License 2.0 | |
Apache License 2.0 | |
Apache License 2.0 |
Qt QML
BSD 2-clause "Simplified" License |
Qt Quick Controls
MIT 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 with Linux Syscall Note | |
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 | |
MIT License | |
HPND License | |
HPND License | |
MIT License | |
MIT License | |
Wayland xdg-decoration Protocol, version unstable v1, version 1 | MIT License |
Qt WebEngine
Apache 2.0 | |
MPL 2.0 | |
Apache 2.0 | |
BSD | |
Apache 2.0 | |
BSL (v 1.0) | |
BSDish | |
Breakpad, An open-source multi-platform crash reporting system | New BSD, Apple PSL 2.0 and Apache 2.0 |
MIT | |
New BSD | |
Apache 2.0 | |
Apache 2.0 | |
BSD | |
BSD | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apple Public Source License 2.0 | |
MIT-like | |
MIT | |
Apache 2.0 | |
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives | MIT |
Apache 2.0 | |
MIT | |
Custom license "inspired by the BSD, Artistic, and IJG (Independent | |
Apache 2.0 | |
Apache 2.0 | |
Apache License 2.0 | |
Google fork of Khronos reference front-end for GLSL and ESSL | MIT |
Apache 2.0, LGPL 2.1 | |
BSD | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
BSD 3-Clause | |
MIT/X11, SGI Free Software License B | |
Public Domain | |
Apache 2.0 | |
New BSD | |
Apache 2.0 | |
BSD | |
BSD | |
MIT | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
MPL 2 | |
BSD | |
By exception only | |
2-Clause BSD | |
BSD | |
BSD 3-Clause | |
BSD | |
BSD | |
BSD | |
Apache2 | |
BSD | |
MIT | |
BSD 3-Clause | |
MIT, Public Domain | |
MIT | |
BSD | |
New BSD | |
BSD | |
University of Illinois/NCSA Open Source License | |
Apache 2.0 and compatible licenses | |
BSD 3-clause "New" or "Revised" License | |
BSD | |
Non-standard | |
BSD | |
LGPL 2.1 | |
Apache 2.0 | |
BSD and LGPL v2 and LGPL v2.1 | |
BSD | |
BSD | |
BSD | |
Microsoft Permissive License | |
BSD 3-Clause | |
BSD 2-Clause License | |
BSD 3-Clause | |
BSD | |
BSD | |
Freely Distributable | |
LGPL 2.1 | |
BSD 3-Clause | |
BSD | |
MIT | |
MIT | |
BSD | |
Apache 2.0 | |
MIT | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
Custom license | |
MIT | |
BSD | |
MIT | |
University of Illinois/NCSA Open Source | |
Apache 2.0 | |
MIT | |
BSD | |
BSD | |
Custom license | |
Custom license | |
Libpng license | |
Apache 2.0 | |
LGPL 2.1 | |
3-clause BSD | |
LGPL 2.1 | |
LGPL 2.1 | |
BSD | |
MIT | |
MIT | |
BSD | |
BSD | |
MIT and 2-clause BSD | |
MIT and LGPL v2 | |
BSD | |
BSD | |
Custom license | |
BSD | |
Apache 2.0 | |
BSD 3-Clause | |
Apache 2.0 | |
MIT | |
Public domain | |
BSD | |
SIL OPEN FONT LICENSE, GPL v2, Bitstream Vera Fonts Copyright | |
Public domain and BSD | |
BSD and MPL 1.1/GPL 2.0/LGPL 2.1 | |
New BSD | |
LGPL 2.1 | |
BSD | |
Apache 2.0 | |
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 |
Qt XML Patterns
W3C Software Notice and Document License (2015-05-13) |
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 | |
University of Illinois/NCSA Open Source License, BSD licenses | |
Information about changes of licenses in Qt and Third Party Modules | |
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. | |
Commercial and BSD 3-clause "New" or "Revised" License. | |
Commercial and BSD 3-clause "New" or "Revised" License. | |
Information about trademarks owned by The Qt Company and other organizations. |
© 2019 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.