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
Boost Software License 1.0 | |
BSD 3-Clause "New" or "Revised" License | |
MIT License and BSD 2-Clause "Simplified" License | |
BSD 3-clause "New" or "Revised" License | |
MIT License and BSD 3-Clause "New" or "Revised" License | |
MIT License | |
Zlib License | |
Boost Software License 1.0 | |
Public Domain | |
Zlib License | |
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 Core
BLAKE2 (reference implementation), version 3d6155ab1682e68c30f93064f988247508f55bbe | Creative Commons Zero v1.0 Universal or Apache License 2.0 |
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 |
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 | |
The Public Suffix List, version f2cce86a42f38265c67caa32c6e0ff61793bb534, fetched on 2021-01-21 | Mozilla Public License 2.0 |
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 | |
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 | |
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 OPC UA
Creative Commons CCZero 1.0 Universal License | |
Mozilla Public 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 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 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 |
Shader Tools
SPIRV-Cross, version c5f7b55756886a2e78cbc2e7a40e8091e17f6310 | 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 and other organizations. |
© 2021 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.