- Qt 6.11
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- Third-Party Code Used in Qt
- Qt 6.11.1 Reference Documentation

Qt Licensing ◦ License of Qt examples

# 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 6.11.1, 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 6.0.4 | 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 Canvas Painter

NanoVG, version f93799c | Zlib License

## Qt Core

Apache Tika MimeType Definitions, version 408c26e1e03e018a623e732dff6fb047a2fb8e19 | 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 1.3.2 | 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 3.4.0 | BSD 3-clause "New" or "Revised" License
MD4 | Public Domain
MD5 | Public Domain
PCRE2 - Stack-less Just-In-Time Compiler, version 10.47 | BSD 2-clause "Simplified" License
PCRE2, version 10.47 | 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 1.0.0 | 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 7.0 | MIT License
Unicode Character Database (UCD), version 36 | Unicode License Agreement - Data Files and Software (2016)
Unicode Common Locale Data Repository (CLDR), version v48.1 | Unicode License v3
forkfd | MIT License
tl::expected, version 41d3e1f48d682992a2230b2a715bca38b848b269 | Creative Commons Zero v1.0 Universal

## Qt D-Bus

libdbus-1 headers, version 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 2.14.3 | Freetype Project License or GNU General Public License v2.0 only
HarfBuzz-NG, version 14.2.0 | MIT License
LibJPEG-turbo, version 3.1.4 | Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License
LibPNG, version 1.6.58 | 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 3.2.1 | 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 4.7.1 | Libtiff License
WebP (libwebp), version 1.6.0 | BSD 3-clause "New" or "Revised" License

## Qt Multimedia

DR Libs, version 0.14.5 | Unlicense or MIT No Attribution
FFmpeg, version 7.1.3 | 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
Two-Level Segregated Fit, version v3.1 | BSD 3-Clause "New" or "Revised" License
boost | Boost Software License 1.0
libjpeg | Independent JPEG Group License
zlib | Zlib License

## Qt Network

The Public Suffix List, version 2026-01-16_13-11-47_UTC | Mozilla Public License 2.0
libpsl - C library to handle the Public Suffix List, version 664f3dc85259ec65e30248a61fa1c45b7b0e4c3f | BSD 3-clause "New" or "Revised" License

## Qt OPC UA

Open62541, version 1.4.14 | Mozilla Public License 2.0 and Creative Commons Zero v1.0 Universal and Creative Commons Attribution Share Alike 4.0 International and BSD 3-Clause "New" or "Revised" License and Apache License 2.0 and MIT License

## Qt PDF

Abseil | Apache-2.0
FreeType | FTL
PDFium | BSD
The Chromium Project | BSD 3-clause "New" or "Revised" License
fast_float | MIT
icu | MIT
libjpeg-turbo | IJG, BSD-3, Zlib
libpng | Libpng-2.0, Libpng
zlib | Zlib

## Qt Positioning

Clip2Tri Polygon Triangulation Library, version commit f62a734d22733814b8a970ed8a68a4d94c24fa5f | 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

Yoga, version 2.0.1 | MIT License

## Qt Quick 3D

Bake | CC0 License
Blue Noise Texture | Creative Commons Zero v1.0 Universal
Camera Viewfinder | MIT License
Colosseum | CC0 License
Cornell | CC0 License
Godot Engine: Fog | MIT License
Godot Engine: ProceduralSky | MIT License
House Simple Bold | 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 1.9.6 | MIT License
Night Light Disabled | LGPL 3.0 License
Open Asset Import Library, version 6.0.4 | BSD 3-clause "New" or "Revised" Licensee
OpenXR SDK, version 1.1.54 | Apache License 2.0
Right Arrow Backup 2 SVG Vector | CC0 License
Screen Shared | LGPL 3.0 License
Tiny OpenEXR, version 1.0.13 | BSD 3-clause "New" or "Revised" License
closestPointOnTriangle | Apache License Version 2.0
meshoptimizer, version 1.0 | 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 3.53.0 | SQLite Blessing

## Qt SVG

XSVG | Historical Permission Notice and Disclaimer - sell variant

## Qt Sensors

Android getRotationMatrix and getOrientation | Apache License 2.0

## Qt Shader Tools

SPIRV-Cross, version 998146d76fc5cbb2726f44c55e25fa28a573a782 | Apache License 2.0 and MIT Khronos - old variant
glslang, version 16.1.0 | 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 5.1.0 | Mozilla Public License 2.0 and BSD 3-Clause "New" or "Revised" License
Resonance Audio, version e225aedb5ec76ca6a0fe7079c0b84dbcbb490553 | 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 3.25.1 | BSD 4-clause "Original" or "Old" License

## Qt Virtual Keyboard

OpenWnn | Apache License 2.0
PinyinIME | Apache License 2.0
Traditional Chinese IME (tcime) | Apache License 2.0 and BSD 3-clause "New" or "Revised" License

## Qt Wayland Compositor

Wayland IVI Extension Protocol, version 1.9.1 | MIT License

## Qt WebEngine

@puppeteer/replay | Apache-2.0
@vscode/web-custom-data | MIT
Abseil | Apache-2.0
Acorn, a tiny, fast JavaScript parser written in JavaScript. | MIT
Alliance for Open Media Video Codec | BSD-2-Clause, Patent
Almost Native Graphics Layer Engine | BSD
Android Explicit Synchronization | Apache-2.0
BoringSSL | MIT, BSD-3-Clause, OpenSSL, ISC, SSLeay
Brotli | MIT
C++ Signal/Slot Library | Ignorable
CRC32C | BSD-3-Clause
CSP Evaluator Core Library, a tool that allows developers to check if a Content Security Policy (CSP) serves as mitigation against XSS attacks | Apache-2.0
Chromium License | BSD
CityHash | MIT
CodeMirror 5 | MIT
CodeMirror 6 | MIT
Compact Encoding Detection | Apache-2.0
Compact Language Detector v3 | Apache-2.0
Crashpad | Apache-2.0
Dawn | BSD-3-Clause
Devtools-Frontend | BSD-3-Clause
Emoji Segmenter | Apache-2.0
Expat XML Parser | MIT
FP16 | MIT
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives | Apache-2.0
FlatBuffers | Apache-2.0
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package | LicenseRef-takuya-ooura
Google Double Conversion | BSD-3-Clause
Headers for the Windows 10 WebAuthn API (webauthn.dll) | MIT
Highway: C++ library for SIMD | Apache-2.0
In line A-law and u-law conversion routines | Custom license
Ink | Apache-2.0
Ink Stroke Modeler | Apache-2.0
LZMA SDK | LZMA-SDK-9.22
LevelDB: A Fast Persistent Key-Value Store | BSD-3-Clause
Libtess2 | SGI-B-2.0
Lighthouse | Apache License 2.0
Lighthouse i18n.js | Apache-2.0
Lit | BSD-3-Clause
Lit | BSD-3-Clause
Marked | BSD-3-Clause, MIT
Material color utilities | Apache-2.0
Metrics Protos | BSD-3-Clause
NVidia Control X Extension Library | MIT
OTS (OpenType Sanitizer) | BSD-3-Clause
One Euro Filter | BSD-3-Clause
PDFium | BSD
PFFFT: a pretty fast FFT. | Pffft
Paul Hsieh&#x27;s SuperFastHash | BSD-3-Clause
Perfetto | Blessing, BSD-3-Clause, Apache-2.0
Polymer | BSD-3-Clause
Private Join and Compute subset | Apache-2.0
Protocol Buffers | BSD-3-Clause
Protocol Buffers (javascript) | BSD-3-Clause
Puppeteer Core | Apache-2.0
QUICHE | BSD-3-Clause
Recurrent neural network for audio noise reduction | BSD-3-Clause
SPIR-V Headers | Apache-2.0
SPIR-V Tools | Apache-2.0
Search Engines resources | BSD-3-Clause
Snappy: A fast compressor/decompressor | BSD-3-Clause, CC-BY-4.0, MIT, CC-BY-3.0
Speech Dispatcher | LGPL-2.1
The Chromium Project | BSD 3-clause "New" or "Revised" License
The Diff Match and Patch libraries offer robust algorithms to perform the operations required for synchronizing plain text. | Apache-2.0
The ITU G.722 codec, encode and decode part. | Custom license
URI Template Parser | Apache-2.0
URL Pattern Library | MIT
V8 fork of fdlibm | SunPro
Volk Meta loader for Vulkan API | MIT
Vulkan API headers | Apache-2.0
Vulkan Loader Components | Apache-2.0
VulkanMemoryAllocator | MIT
Wasmparser | Apache-2.0
Web Vitals | Apache-2.0
WebKit | BSD and LGPL v2 and LGPL v2.1
WebM container parser and writer. | BSD-3-Clause, Patent
WebP image encoder/decoder | BSD-3-Clause, Patent
WebRTC | BSD
Wuffs (Wrangling Untrusted File Formats Safely) | Apache-2.0
Zstandard | BSD-3-Clause
cpuinfo | BSD-2-Clause
d3 | ISC
dav1d is an AV1 decoder :) | BSD-2-Clause
dragonbox | BSL-1.0
fast_float | MIT
ffmpeg | LGPL 2.1
fft | Custom license
flac | BSD
fontconfig | Public-domain-md5, MIT-Modern-Variant, HPND-sell-variant, MIT
google-glog&#x27;s symbolization library | BSD-3-Clause
harfbuzz-ng | MIT-Modern-Variant
hunspell | MPL-1.1
icu | MIT
inspector protocol | BSD-3-Clause
inspector protocol | BSD-3-Clause
intl-messageformat | BSD-3-Clause
ipcz | BSD
json5 | MIT
jsoncpp | JsonCPP
khronos_platform | Apache 2.0
legacy-javascript | Apache
libaddressinput | Apache-2.0
libavif - Library for encoding and decoding .avif files | BSD-2-Clause, MIT
libgav1 | Apache-2.0
libpng | Libpng-2.0, Libpng
libsrtp | 3-clause BSD
libvpx | BSD-3-Clause, Patent
libxml | MIT
libxslt | X11
libyuv | BSD-3-Clause
minigbm | BSD-3-Clause
modp base64 decoder | BSD-3-Clause
opus | Opus-Patent-BSD-3-Clause
rapidhash | BSD-2-Clause
re2 - an efficient, principled regular expression library | BSD-3-Clause
simdutf unicode transcoder | MIT
source-map-scopes-codec | BSD-3-Clause
spl sqrt floor | SPL-SQRT-FLOOR
sqlite | Blessing
third-party-web | MIT
woff2 | MIT
xdg-user-dirs | MIT
zlib | Zlib

## 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 and CycloneDX formats
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