Third-Party Code Used in Qt

Qt libraries and plugins can contain code that is not intellectual property of The Qt Company, but is available under specific open-source 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 acknowledge and comply with the licenses of the third-party components that you are actually shipping with your application. Click the name of the component to see the licensing details.

Third-party Licenses

The following sections list third-party components in Qt 6.10.0, grouped by Qt module. If the third-party component itself consists of parts that are of a different origin (so-called 4th-party or Nth-party code), these are listed, too.

Starting from Qt 6.8, Software Bill of Materials (SBOM) documents of third-party components in Qt are available. Information such as copyrights, licenses, versions, source repositories, and other relevant information are declared in SPDX 2.3 format. For more information, visit the Software Bill of Materials page.

Qt 3D

Dear ImGui - ProggyClean.ttf	MIT License
Dear ImGui - stb	MIT License or Public Domain
Dear ImGui, version v1.91.0	MIT License
Open Asset Import Library, version 5.4.3	BSD 3-clause "New" or "Revised" Licensee

Qt 5 Core Compatibility APIs

Text Codec: EUC-JP	BSD 2-clause "Simplified" License
Text Codec: EUC-KR	BSD 2-clause "Simplified" License
Text Codec: GBK	BSD 2-clause "Simplified" License
Text Codec: ISO 2022-JP (JIS)	BSD 2-clause "Simplified" License
Text Codec: Shift-JIS	BSD 2-clause "Simplified" License
Text Codec: TSCII	BSD 2-clause "Simplified" License
Text Codecs: Big5, Big5-HKSCS	BSD 2-clause "Simplified" License

Qt Bluetooth

BlueZ

GNU General Public License v2.0 only (This does not force user code to be GPL'ed. For more info see details.)

Qt Core

Apache Tika MimeType Definitions, version 5101bc7fb090ed7deffe56837d7633c9485a1e5d	Apache License 2.0
BLAKE2 (reference implementation), version ed1974ea83433eba7b2d95c5dcd9ac33cb847913	Creative Commons Zero v1.0 Universal or Apache License 2.0
Data Compression Library (zlib), version 1.3.1	Zlib License
Easing Equations by Robert Penner	BSD 3-clause "New" or "Revised" License
Efficient Binary-Decimal and Decimal-Binary Conversion Routines for IEEE Doubles, version 3.3.0	BSD 3-clause "New" or "Revised" License
KWin, version 5.13.4	BSD-3-Clause
KWin, version 5.13.4	BSD-3-Clause
MD4	Public Domain
MD5	Public Domain
PCRE2 - Stack-less Just-In-Time Compiler, version 10.45	BSD 2-clause "Simplified" License
PCRE2, version 10.45	BSD 3-clause "New" or "Revised" License with PCRE2 binary-like Packages Exception
QEventDispatcher on macOS	BSD 3-clause "New" or "Revised" License
Secure Hash Algorithm SHA-1	Public Domain
Secure Hash Algorithm SHA-3 - Keccak, version 3.2	Creative Commons Zero v1.0 Universal
Secure Hash Algorithm SHA-3 - brg_endian, version 4b9e13ead2c5b5e41ca27c65de4dd69ae0bac228	BSD 2-clause "Simplified" License
Secure Hash Algorithms SHA-384 and SHA-512	BSD 3-clause "New" or "Revised" License
SipHash Algorithm	Creative Commons Zero v1.0 Universal
TinyCBOR, version 0.6.0	MIT License
Unicode Character Database (UCD), version 34	Unicode License Agreement - Data Files and Software (2016)
Unicode Common Locale Data Repository (CLDR), version v46.1	Unicode License v3
extra-cmake-modules, version 5.84.0	BSD-3-Clause
extra-cmake-modules, version 5.84.0	BSD-3-Clause
forkfd	MIT License

Qt D-Bus

libdus-1 headers, version dbus-1.13.12

Academic Free License v2.1, or GNU General Public License v2.0 or later

Qt GUI

Adobe Glyph List For New Fonts, version 1.7	BSD 3-Clause "New" or "Revised" License
Anti-aliasing rasterizer from FreeType 2	Freetype Project License or GNU General Public License v2.0 only
Cocoa Platform Plugin	BSD 3-clause "New" or "Revised" License
D3D12 Memory Allocator, version f128d39b7a95b4235bd228d231646278dc6c24b2	MIT License
DejaVu Fonts, version 2.37	Bitstream Vera Font License
Emoji Segmenter, version 0.4.0	Apache License 2.0
Freetype 2 - Bitmap Distribution Format (BDF) support	MIT License
Freetype 2 - Portable Compiled Format (PCF) support	MIT License and MIT Open Group variant
Freetype 2 - zlib	Zlib License
Freetype 2, version 2.13.3	Freetype Project License or GNU General Public License v2.0 only
HarfBuzz-NG, version 10.4.0	MIT License
LibJPEG-turbo, version 3.1.0	Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License
LibPNG, version 1.6.47	Libpng License and PNG Reference Library version 2
MD4C, version 0.5.2	MIT License
Mipmap generator for D3D12, version 0aa79bad78992da0b6a8279ddb9002c1753cb849	MIT License
Native Style for Android	Apache License 2.0
OpenGL ES 2 Headers, version Revision 27673	MIT License
OpenGL Headers, version Revision 27684	MIT License
Pixman, version 0.17.12	MIT License
Smooth Scaling Algorithm	BSD 2-clause "Simplified" License and Imlib2 License
Vulkan API Registry, version 1.4.308	Apache License 2.0 or MIT License
Vulkan Memory Allocator, version 3.1.0	MIT License
WebGradients	MIT License
Wintab API	LCS-Telegraphics License
X Server helper	X11 License and Historical Permission Notice and Disclaimer
XCB-XInput	MIT License
sRGB color profile icc file	International Color Consortium License

Qt Image Formats

TIFF Software Distribution (libtiff), version 4.7.0	Libtiff License
WebP (libwebp), version 1.5.0	BSD 3-clause "New" or "Revised" License

Qt Multimedia

FFmpeg, version n7.1	GNU Lesser General Public License v2.1 or later and BSD 3-Clause "New" or "Revised" License and BSD 2-Clause "Simplified" License and BSD Source Code Attribution and ISC License and MIT License and Mozilla Public License 2.0
Signalsmith Stretch, version 1.0.0	MIT License
boost	Boost Software License 1.0
libjpeg	Independent JPEG Group License
zlib	Zlib License

Qt Network

The Public Suffix List, version 47264b57765919188b9f4144de8d95cf77e1b6dc, fetched on 2025-01-22	Mozilla Public License 2.0
libpsl - C library to handle the Public Suffix List, version 664f3dc85259ec65e30248a61fa1c45b7b0e4c3f	BSD 3-clause "New" or "Revised" License

Qt Positioning

Clip2Tri Polygon Triangulation Library	MIT License
Clipper Polygon Clipping Library, version 6.4.2	Boost Software License 1.0
Poly2Tri Polygon Triangulation Library, version commit a922022da4c0d3a55b1d6b6d634219caea653053	BSD 3-clause "New" or "Revised" License

Qt Qml

JavaScriptCore Macro Assembler

BSD 2-clause "Simplified" License

Qt Quick 3D

Godot Engine: Fog	MIT License
Godot Engine: ProceduralSky	MIT License
Intel Embree, version 3.13.3	Apache License 2.0
Java Native Interface for C++, version 1.0.0	MIT License
JsonCpp, version 1.9.5	MIT License
Open Asset Import Library, version 5.4.3	BSD 3-clause "New" or "Revised" Licensee
OpenXR SDK, version 1.1.42	Apache License 2.0
Tiny OpenEXR, version v1.0.9	BSD 3-clause "New" or "Revised" License
meshoptimizer, version v0.18	MIT License
xatlas, version 16ace528acd2cf1f16a7c0dde99c42c486488dbe	MIT License

Qt Quick 3D Physics

NVIDIA PhysX SDK, version PhysX_4.1.2.29882248

BSD 3-Clause "New" or "Revised" License

Qt Quick Controls

Shadow values from Angular Material

MIT License

Qt SQL

SQLite, version 3.49.1

SQLite Blessing

Qt SVG

XSVG	Historical Permission Notice and Disclaimer - sell variant

Qt Shader Tools

SPIRV-Cross, version ebe2aa0cd80f5eb5cd8a605da604cacf72205f3b	Apache License 2.0 and MIT Khronos - old variant
glslang, version 15.1.0	BSD 3-Clause "New" or "Revised" License, and MIT Khronos - old variant, and Apache License 2.0, and GNU General Public License v3.0 or later with Bison exception 2.2, and AML glslang variant License

Qt Spatial Audio

Eigen, version 3.4.0	Mozilla Public License 2.0 and BSD 3-Clause "New" or "Revised" License
Resonance Audio, version e225aedb5ec7	Apache License 2.0
pffft, version 02fe7715a5bf8bfd914681c53429600f94e0f536	BSD 3-Clause "New" or "Revised" License

Qt Test

Catch2, version 2.13.10	Boost Software License 1.0
Cycle, version 3.3.10	MIT License
Linux Performance Events, version 6.13	GNU General Public License v2.0 only with Linux Syscall Note
Valgrind, version 3.24.0	BSD 4-clause "Original" or "Old" License

Additional Information

The following table lists related documents, such as information about Trademarks and other licenses used in parts of Qt.

Android GNU C++ Run-time Licensing	Provides additional information about the licensing of run-time dependencies of Qt for Android
LLVM Attribution	University of Illinois/NCSA Open Source License, BSD licenses
License Changes	Information about changes of licenses in Qt and Third Party Modules
Macros for Building with CMake	BSD 3-clause "New" or "Revised" License
Mesa llvmpipe	MIT License and Boost Software License 1.0
Notes about PDF Licensing	Details of restrictions on the use of PDF-related trademarks
Software Bill of Materials	Qt package information in SPDX format
The QtEntryPoint Library	Commercial and BSD 3-clause "New" or "Revised" License.
Trademarks	Information about trademarks owned by The Qt Company.

Qt Licensing License of Qt examples

© 2025 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.