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.
The following sections list third-party components in Qt 6.9.1, 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 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 0.6.1
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 11.2.1
MIT License
LibJPEG-turbo, version 3.1.0
Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License
LibPNG, version 1.6.48
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 1.3.223
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
TIFF Software Distribution (libtiff), version 4.7.0
Libtiff License
WebP (libwebp), version 1.5.0
BSD 3-clause "New" or "Revised" License
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 OPC UA
Open62541, version v1.4.9
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
harfbuzz-ng
MIT
icu
MIT
libjpeg-turbo
IJG, BSD-3, Zlib
libpng
Libpng license
zlib
Zlib
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 v1.0.12
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 3.49.2
SQLite Blessing
Qt SVG
XSVG
Historical Permission Notice and Disclaimer - sell variant
Qt Sensors
Android getRotationMatrix and getOrientation
Apache License 2.0
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
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
Presentation Time Protocol, version 1
MIT License
Wayland Dialog Protocol, version 1
MIT License
Wayland EGLStream Controller Protocol, version 1.1.1
MIT License
Wayland Fractional Scale Protocol, version 1
MIT License
Wayland Fullscreen Shell Protocol, version unstable v1
MIT License
Wayland IVI Extension Protocol, version 1.9.1
MIT License
Wayland KDE DBus Menu Protocol, version 1
GNU Lesser General Public License 2.1 or later
Wayland Linux Dmabuf Unstable V1 Protocol, version unstable v1, version 3
MIT License
Wayland Pointer Gestures Protocol, version unstable v1, version 2
MIT License
Wayland Primary Selection Protocol, version 1
MIT License
Wayland Protocol, version 1.23.0
MIT License
Wayland Scaler Protocol, version 2
MIT License
Wayland Tablet Protocol, version unstable v2, version 1
MIT License
Wayland Text Input Protocol v1, version unstable v1
MIT License
Wayland Text Input Protocol v2, version unstable v2
HPND License
Wayland Text Input Protocol, version unstable v3
MIT License
Wayland Viewporter Protocol, version 1
MIT License
Wayland XDG Foreign Protocol, version 1
MIT License
Wayland XDG Output Protocol, version unstable v1, version 3
MIT License
Wayland XDG Shell Protocol, version 1.18
MIT License
Wayland XDG System Bell Protocol, version 1.18
MIT License
Wayland xdg-activation Protocol, version unstable v1, version 1
MIT License
Wayland xdg-decoration Protocol, version unstable v1, version 1
MIT License
Wayland xdg-toplevel-icon Protocol, version version 1
MIT License
Wlr Data Control Unstable V1 Protocol, version 2
MIT License
Qt WebEngine
@puppeteer/replay
Apache-2.0
@vscode/web-custom-data
MIT
AXE-CORE Accessibility Audit
MPL 2.0
Abseil
Apache 2.0
Abseil
Apache 2.0
Acorn, a tiny, fast JavaScript parser written in JavaScript.
MIT
Alliance for Open Media Video Codec
BSD
Alliance for Open Media Video Codec
BSD
Almost Native Graphics Layer Engine
BSD
Android Explicit Synchronization
Apache 2.0
Android Explicit Synchronization
Apache 2.0
BoringSSL
BSDish
BoringSSL
BSDish
Brotli
MIT
Brotli
MIT
C++ Signal/Slot Library
Ignorable
C++ Signal/Slot Library
Ignorable
CRC32C
New BSD
CRC32C
New BSD
CSP Evaluator Core Library, a tool that allows developers to check if a Content Security Policy (CSP) serves as mitigation against XSS attacks
Apache
Chromium License
BSD
CityHash
MIT
CityHash
MIT
CodeMirror 5
MIT
CodeMirror 6
MIT
Compact Encoding Detection
Apache 2.0
Compact Encoding Detection
Apache 2.0
Compact Language Detector v3
Apache 2.0
Crashpad
Apache 2.0
Crashpad
Apache 2.0
Dawn
BSD 3-Clause
Devtools-Frontend
BSD
Emoji Segmenter
Apache 2.0
Expat XML Parser
MIT
Expat XML Parser
MIT
FP16
MIT
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives
MIT
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives
MIT
FlatBuffers
Apache 2.0
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package
Custome license
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package
Custome license
Google Double Conversion
BSD
Google Double Conversion
BSD
Headers for the Windows 10 WebAuthn API (webauthn.dll)
MIT
Highway: C++ library for SIMD
Apache 2.0
Implementation of WebDriver BiDi standard
Apache 2.0
LevelDB: A Fast Persistent Key-Value Store
New BSD
Lighthouse
Apache License 2.0
Lighthouse i18n.js
Apache License 2.0
Lit
BSD 3-Clause
Lit
BSD-3
Lit
BSD 3-Clause
Marked
MIT
Material color utilities
Apache License 2.0
Metrics Protos
BSD
Metrics Protos
BSD
NVidia Control X Extension Library
MIT
OTS (OpenType Sanitizer)
BSD
One Euro Filter
BSD
PDFium
BSD
PFFFT: a pretty fast FFT.
BSD-like
PFFFT: a pretty fast FFT.
BSD-like
PSM (Private Set Membership) client side
Apache Version 2.0
Paul Hsieh's SuperFastHash
BSD
Paul Hsieh's SuperFastHash
BSD
Perfetto
Apache2
Perfetto
Apache2
Polymer
BSD
Polymer
BSD
Protocol Buffers
BSD
Protocol Buffers
BSD
Protocol Buffers (javascript)
BSD
Protocol Buffers (javascript)
BSD
Puppeteer Core
Apache-2.0
QUICHE
BSD
QUICHE
BSD
Recurrent neural network for audio noise reduction
BSD 3-Clause
Recurrent neural network for audio noise reduction
BSD 3-Clause
SPIR-V Headers
MIT
SPIR-V Tools
Apache 2.0
Selenium Atoms
Apache 2
Simple Homomorphic Encryption Library with Lattices
Apache Version 2.0
Sizzle
MIT
Snappy: A fast compressor/decompressor
New BSD
Speech Dispatcher
GNU Lesser Public License
The Chromium Project
BSD 3-clause "New" or "Revised" License
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 License 2.0
The Incremental Distributed Point Functions library
Apache 2.0
URI Template Parser
Apache 2.0
URI Template Parser
Apache 2.0
URL Pattern Library
MIT
URL Pattern Library
MIT
V8 fork of fdlibm
Fdlibm license
Volk Meta loader for Vulkan API
MIT
Vulkan API headers
Apache 2.0
Vulkan API headers
Apache 2.0
Vulkan Loader Components
Apache 2.0
VulkanMemoryAllocator
MIT
Wasmparser
Apache
Web Vitals
Apache
WebKit
BSD and LGPL v2 and LGPL v2.1
WebKit
BSD and LGPL v2 and LGPL v2.1
WebM container parser and writer.
BSD
WebP image encoder/decoder
BSD
WebP image encoder/decoder
BSD
WebRTC
BSD
WebRTC
BSD
Wicked Good XPath
MIT
Wuffs (Wrangling Untrusted File Formats Safely)
Apache 2.0
Wuffs (Wrangling Untrusted File Formats Safely)
Apache 2.0
Zstandard
BSD or GPLv2
Zstandard
BSD or GPLv2
cpuinfo
BSD
d3
BSD 3-Clause
d3
BSD 3-Clause
dav1d is an AV1 decoder :)
2-Clause BSD
dav1d is an AV1 decoder :)
2-Clause BSD
fast_float
MIT
ffmpeg
LGPL 2.1
flac
BSD
fontconfig
MIT
fontconfig
MIT
google-glog's symbolization library
BSD
google-glog's symbolization library
BSD
google-jstemplate
Apache 2.0
google-jstemplate
Apache 2.0
harfbuzz-ng
MIT
harfbuzz-ng
MIT
hunspell
MPL 1.1/GPL 2.0/LGPL 2.1
icu
MIT
icu
MIT
inspector protocol
BSD
inspector protocol
BSD
intl-messageformat
New BSD
ipcz
BSD
ipcz
BSD
jsoncpp
MIT
jsoncpp
MIT
libaddressinput
Apache 2.0
libavif - Library for encoding and decoding .avif files
2-Clause BSD
libavif - Library for extracting metadata from .avif files
2-Clause BSD
libevent
BSD
libevent
BSD
libgav1
Apache 2.0
libpng
Libpng license
libpng
Libpng license
libsrtp
3-clause BSD
libsrtp
3-clause BSD
libvpx
BSD
libvpx
BSD
libxml
MIT
libxslt
MIT
libyuv
BSD
libyuv
BSD
mesa_headers
MIT and SGI Free Software B License Version 2.0
minigbm
BSD
mitt
MIT
modp base64 decoder
BSD
modp base64 decoder
BSD
opus
BSD
opus
BSD
rapidhash
BSD 2-clause
re2 - an efficient, principled regular expression library
BSD 3-Clause
re2 - an efficient, principled regular expression library
BSD 3-Clause
sql sqrt floor
SPL-SQRT-FLOOR
sql sqrt floor
SPL-SQRT-FLOOR
sqlite
Public domain
sqlite
Public domain
third-party-web
MIT
woff2
MIT
xdg-user-dirs
MIT
xdg-user-dirs
MIT
zlib
Zlib
zlib
Zlib
zod
MIT
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.
©
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.
