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 5.15.17 that incorporate code licensed under third-party open-source licenses:
Qt 3D
MIT License | |
MIT License or Public Domain | |
MIT License | |
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 3.1.5 | 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 with PCRE2 binary-like Packages Exception | |
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 | |
The Public Suffix List, version 883ced078a83f9d79a98933145425c221a5e51f0, fetched on 2024-01-30 | 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 | |
MIT 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 | |
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 | |
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 | |
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 Location
Boost Software License 1.0 | |
MIT License | |
MIT License | |
Boost Software License 1.0 | |
ISC License | |
ISC License | |
BSD 2-clause "Simplified" License and zlib License | |
Boost Software License 1.0 | |
BSD 3-clause "New" or "Revised" License | |
MIT License | |
ISC License | |
MIT License | |
MIT License | |
ISC License | |
ISC License | |
ISC License | |
Geosimplify-js License | |
ISC License | |
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 OPC UA
Creative Commons CCZero 1.0 Universal License | |
Mozilla Public License 2.0 |
Qt Purchasing
Apache License 2.0 | |
Apache License 2.0 | |
Apache License 2.0 | |
Apache License 2.0 |
Qt QML
BSD 2-clause "Simplified" License |
Qt Quick 3D
BSD 3-clause "New" or "Revised" Licensee |
Qt Quick Controls
MIT License |
Qt SQL
Public Domain |
Qt SVG
Historical Permission Notice and Disclaimer - sell variant |
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 | |
MIT License | |
Wayland Linux Dmabuf Unstable V1 Protocol, version unstable v1, version 3 | MIT License |
MIT License | |
MIT License | |
MIT License | |
MIT License | |
HPND License | |
MIT License | |
MIT License | |
MIT License | |
Wayland xdg-decoration Protocol, version unstable v1, version 1 | MIT License |
Qt WebEngine
BSD | |
Apache 2.0 | |
Apache 2.0 | |
MPL 2.0 | |
Apache 2.0 | |
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 | |
BSD | |
BSD | |
MIT | |
Apache 2.0 | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apple Public Source License 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
MIT | |
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 | |
Apache 2.0 | |
MIT | |
BSD | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
BSD 3-Clause | |
MIT/X11, SGI Free Software License B | |
MIT | |
Public Domain | |
New BSD | |
MIT | |
Apache 2.0 | |
BSD | |
MIT | |
Apache 2.0 | |
MPL 1.1/GPL 2.0/LGPL 2.1 | |
2-Clause BSD | |
MPL 2 | |
BSD | |
By exception only | |
BSD | |
BSD | |
BSD | |
2-Clause BSD | |
BSD | |
BSD-like | |
BSD | |
Apache Version 2.0 | |
BSD | |
Apache2 | |
BSD | |
Apache 2.0 | |
BSD | |
BSD | |
MIT | |
BSD 3-Clause | |
MIT, Public Domain | |
MIT | |
Apache 2.0 | |
Apache 2.0 | |
Schema.org is a collaborative, community activity with a mission to | Creative Commons Attribution-ShareAlike 3.0 Unported |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Apache Version 2.0 | |
BSD | |
New BSD | |
BSD | |
University of Illinois/NCSA Open Source License | |
Apache 2.0 and compatible licenses | |
Apache 2.0 | |
BSD 3-clause "New" or "Revised" License | |
BSD | |
Apache 2.0 | |
Apache 2.0 | |
Apache 2.0 | |
Non-standard | |
BSD | |
Apache 2.0 | |
MIT | |
LGPL 2.1 | |
Apache 2.0 | |
BSD and LGPL v2 and LGPL v2.1 | |
BSD | |
BSD | |
BSD | |
MIT "Expat" | |
Microsoft Permissive License | |
Apache 2.0 | |
BSD 2-Clause License | |
BSD 3-Clause | |
2-Clause BSD | |
BSD | |
BSD | |
Freely Distributable | |
LGPL 2.1 | |
BSD | |
MIT | |
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 | |
MIT | |
Apache 2.0 | |
2-Clause BSD | |
LGPL 2.1 | |
BSD | |
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 | |
BSD | |
MIT | |
MIT | |
BSD | |
BSD | |
MIT and SGI Free Software B License Version 2.0 | |
BSD | |
BSD | |
Custom license | |
BSD | |
Apache 2.0 | |
New BSD | |
BSD 3-Clause | |
MIT | |
Apache License, Version 2.0 | |
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 | |
MIT | |
Academic Free License version 2.0 or LGPL v2 | |
MIT | |
MIT | |
BSD | |
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 and Boost Software License 1.0 | |
Details of restrictions on the use of PDF-related trademarks | |
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. |
© 2024 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.