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 6.4.3 that incorporate code licensed under third-party open-source licenses:
Qt 3D
MIT License | |
MIT License or Public Domain | |
MIT License |
Qt 5 Core Compatibility APIs
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 |
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
BLAKE2 (reference implementation), version 54f4faa4c16ea34bcd59d16e8da46a64b259fc07 | Creative Commons Zero v1.0 Universal or Apache License 2.0 |
Zlib License | |
BSD 3-clause "New" or "Revised" License | |
BSD 3-clause "New" or "Revised" License | |
BSD-3-Clause | |
BSD-3-Clause | |
BSD-3-Clause | |
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 | |
Creative Commons Zero v1.0 Universal | |
MIT License | |
Unicode License Agreement - Data Files and Software (2016) | |
Unicode License Agreement - Data Files and Software (2016) | |
BSD-3-Clause | |
BSD-3-Clause | |
BSD-3-Clause | |
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 | |
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 and MIT Open Group variant | |
Zlib License | |
Freetype Project License or GNU General Public License v2.0 only | |
MIT License | |
BSD 3-clause "New" or "Revised" License | |
Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License and zlib License | |
Libpng License and PNG Reference Library version 2 | |
MIT License | |
Apache License 2.0 | |
MIT License | |
MIT License | |
MIT License | |
BSD 2-clause "Simplified" License and Imlib2 License | |
Apache License 2.0 or MIT License | |
MIT License | |
MIT License | |
LCS-Telegraphics License | |
X11 License and Historical Permission Notice and Disclaimer | |
MIT License | |
International Color Consortium License |
Qt Image Formats
Libtiff License | |
BSD 3-clause "New" or "Revised" License |
Qt Network
The Public Suffix List, version d17a65633b0286833727ef21e897a22564695ef5, fetched on 2022-05-23 | Mozilla Public License 2.0 |
BSD 3-clause "New" or "Revised" License |
Qt OPC UA
Mozilla Public License 2.0 and Creative Commons Zero v1.0 Universal and Creative Commons Attribution Non Commercial Share Alike 4.0 International and BSD 3-Clause "New" or "Revised" License and Apache License 2.0 and MIT License |
Qt Positioning
MIT License | |
Boost Software License 1.0 | |
BSD 3-clause "New" or "Revised" License |
Qt QML
BSD 2-clause "Simplified" License |
Qt Quick 3D
Apache License 2.0 | |
BSD 3-clause "New" or "Revised" Licensee | |
MIT License | |
BSD 3-clause "New" or "Revised" License | |
MIT License |
Qt Quick 3D Physics
BSD 3-Clause "New" or "Revised" License |
Qt Quick Controls
MIT License |
Qt SQL
Public Domain |
Qt SVG
Historical Permission Notice and Disclaimer - sell variant |
Qt Spatial Audio
Mozilla Public License 2.0 and BSD 3-Clause "New" or "Revised" License | |
Resonance Audio, version e225aedb5ec76ca6a0fe7079c0b84dbcbb490553 | Apache License 2.0 |
BSD 3-Clause "New" or "Revised" License |
Qt Test
Boost Software License 1.0 | |
MIT License | |
GNU General Public License v2.0 only with Linux Syscall Note | |
BSD 4-clause "Original" or "Old" License |
Qt Virtual Keyboard
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 | |
MIT License | |
MIT License | |
Wayland Linux Dmabuf Unstable V1 Protocol, version unstable v1, version 3 | MIT License |
Wayland Pointer Gestures Protocol, version unstable v1, version 2 | MIT License |
MIT License | |
MIT License | |
MIT License | |
MIT License | |
MIT License | |
HPND License | |
HPND License | |
MIT License | |
MIT License | |
MIT License | |
Wayland xdg-activation Protocol, version unstable v1, version 1 | MIT License |
Wayland xdg-decoration Protocol, version unstable v1, version 1 | MIT License |
Qt WebEngine
2-dim General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package | Custom |
Apache 2.0 | |
Apache 2.0 | |
Custom | |
MPL 2.0 | |
Apache 2.0 | |
Acorn, a tiny, fast JavaScript parser written in JavaScript. | MIT |
MIT | |
BSD | |
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 | |
C++ port of zxcvbn, an advanced password strength estimation library. | MIT |
New BSD | |
Apache 2.0 | |
BSD | |
BSD | |
MIT | |
Apache 2.0 | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
MIT | |
MIT | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apple Public Source License 2.0 | |
Apache 2.0 | |
BSD | |
Creative Commons Attribution-ShareAlike 3.0 Unported | |
MPL 2 | |
Apache 2.0 | |
MIT | |
MIT | |
Custom | |
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives | MIT |
MIT | |
Apache 2.0 | |
Custom license "inspired by the BSD, Artistic, and IJG (Independent | |
Apache License, Version 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apache License 2.0 | |
Apache 2.0 | |
BSD | |
MIT | |
Apache 2.0 | |
BSD | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
BSD 3-Clause | |
BSD 3-Clause | |
Apache 2.0 | |
Apache 2.0 | |
MIT/X11, SGI Free Software License B | |
MIT | |
Public Domain | |
New BSD | |
Apache License 2.0 | |
Apache License 2.0 | |
BSD-3 | |
MIT | |
MalDocA source for extracting and analyzing features from Office documents. | Apache 2.0 |
LICENSE | |
Apache 2.0 | |
Apache 2.0 | |
BSD | |
MPL 2 | |
Apache 2.0 | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
2-Clause BSD | |
MPL 2 | |
BSD | |
BSD | |
BSD | |
2-Clause BSD | |
BSD | |
BSD-like | |
BSD | |
Apache Version 2.0 | |
BSD | |
Apache2 | |
BSD | |
Apache 2.0 | |
BSD | |
Apache-2.0 | |
BSD | |
MIT | |
BSD 3-Clause | |
MIT, Public Domain | |
MIT | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apache Version 2.0 | |
BSD | |
New BSD | |
GPL (v2 or later) | |
BSD | |
University of Illinois/NCSA Open Source License | |
Apache 2.0 and compatible licenses | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
BSD 3-clause "New" or "Revised" License | |
Apache License 2.0 | |
Apache 2.0 | |
BSD | |
Apache 2 | |
Apache 2.0 | |
Apache 2.0 | |
MIT | |
MIT-like | |
BSD | |
Fdlibm license | |
Apache 2.0 | |
BSD | |
Apache 2.0 | |
MIT | |
Apache | |
Apache 2.0 | |
BSD and LGPL v2 and LGPL v2.1 | |
BSD | |
BSD | |
BSD | |
MIT | |
Microsoft Permissive License | |
Apache 2.0 | |
BSD 2-Clause License | |
BSD 3-Clause | |
2-Clause BSD | |
BSD | |
BSD | |
Apache 2.0 | |
Freely Distributable | |
LGPL 2.1 | |
BSD | |
BSD | |
MIT | |
Apache 2 | |
BSD | |
Apache 2.0 | |
MIT | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
MIT, MPL 1.1/GPL 2.0/LGPL 2.1, GNU Lesser Public License, Unicode License, Unicode Data License, custom notice license, custom permissive license | |
Custom license | |
MIT | |
BSD | |
New BSD | |
BSD | |
MIT | |
Apache 2.0 | |
2-Clause BSD | |
LGPL 2.1 | |
BSD | |
Apache 2.0 | |
MPL-1.1/GPL-2.0/LGPL-2.1 + BSD-3-Clause + BSD-2-Clause | |
BSD | |
BSD | |
Custom license | |
Libpng license | |
Apache 2.0 | |
LGPL 2.1 | |
3-clause BSD | |
LGPL 2.1 | |
LGPL 2.1 | |
MIT License | |
BSD | |
MIT | |
MIT | |
MIT | |
MIT | |
BSD | |
Custom | |
BSD | |
MIT and SGI Free Software B License Version 2.0 | |
BSD | |
BSD | |
Custom license | |
BSD | |
Apache 2.0 | |
Apache 2.0 | |
New BSD | |
BSD 3-Clause | |
Apache 2.0 | |
MIT | |
Public domain | |
SIL OPEN FONT LICENSE, GPL v2, Bitstream Vera Fonts Copyright | |
BSD and MPL 1.1/GPL 2.0/LGPL 2.1 | |
LGPL 2.1 | |
BSD | |
MIT | |
MIT | |
Academic Free License version 2.0 or LGPL v2 | |
MIT | |
MIT | |
BSD | |
Custom license |
Shader Tools
SPIRV-Cross, version d137abeef57b2f3fdbdab0ad5590fe99a44ba546 | Apache License 2.0 and Khronos License |
BSD 3-Clause "New" or "Revised" License, and Khronos License, and Apache License 2.0, and GNU General Public License v3.0 or later with Bison exception 2.2, and NVIDIA 2002 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 | |
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 | |
Commercial and BSD 3-clause "New" or "Revised" License. | |
Information about trademarks owned by The Qt Company. |
© 2023 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.