• Qt 6.8
  • Third-Party Code Used in Qt
  • Qt 6.8.1 Reference Documentation

Contents

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 6.8.1, 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 54f4faa4c16ea34bcd59d16e8da46a64b259fc07

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

MD4

Public Domain

MD5

Public Domain

PCRE2 - Stack-less Just-In-Time Compiler, version 10.44

BSD 2-clause "Simplified" License

PCRE2, version 10.44

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 https://github.com/BrianGladman/sha/ commit 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 30

Unicode License Agreement - Data Files and Software (2016)

Unicode Common Locale Data Repository (CLDR), version v45

Unicode License v3

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

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 10.1.0

MIT License

IAccessible2 IDL Specification, version 1.3.0

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

LibJPEG-turbo, version 3.0.4

Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License

LibPNG, version 1.6.44

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 3.0.1

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 4.7.0

Libtiff License

WebP (libwebp), version 1.4.0

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

Qt Multimedia

FFmpeg, version n7.0.2

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

boost

Boost Software License 1.0

libjpeg

Independent JPEG Group License

zlib

Zlib License

Qt Network

The Public Suffix List, version 903a83ff7bfc3148e3692e09396f9f3bdc9462ef, fetched on 2024-06-05

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 1.3.11

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

Custom license "inspired by the BSD, Artistic, and IJG (Independent

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 1.0.34

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 3.47.0

SQLite Blessing

Qt SVG

XSVG

Historical Permission Notice and Disclaimer - sell variant

Qt Sensors

Android getRotationMatrix and getOrientation

Apache License 2.0

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

pfft, version fbc4058602803f40dc554b8a5d2bcc694c005f2f

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 6.0

GNU General Public License v2.0 only with Linux Syscall Note

Valgrind, version 3.23.0

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 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 1.19.0

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-activation Protocol, version unstable v1, version 1

MIT License

Wayland xdg-decoration Protocol, version unstable v1, version 1

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

Acorn, a tiny, fast JavaScript parser written in JavaScript.

MIT

Alliance for Open Media Video Codec

BSD

Almost Native Graphics Layer Engine

BSD

Android Explicit Synchronization

Apache 2.0

BoringSSL

BSDish

Brotli

MIT

C++ Signal/Slot Library

Custom license

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

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

Emoji Segmenter

Apache 2.0

Expat XML Parser

MIT

FP16

MIT

FXDiv

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

Google Double Conversion

BSD

Headers for the Windows 10 WebAuthn API (webauthn.dll)

MIT

Highway: C++ library for SIMD

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

Lit

BSD 3-Clause

Lit

BSD-3

Marked

MIT

Material color utilities

Apache License 2.0

Metrics Protos

BSD

OTS (OpenType Sanitizer)

BSD

One Euro Filter

BSD

PDFium

BSD

PFFFT: a pretty fast FFT.

BSD-like

Perfetto

Apache2

Polymer

BSD

Protocol Buffers

BSD

Puppeteer Core

Apache-2.0

QUICHE

BSD

Recurrent neural network for audio noise reduction

BSD 3-Clause

Snappy: A fast compressor/decompressor

New BSD

Speech Dispatcher

GNU Lesser Public 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

URL Pattern Library

MIT

V8 fork of fdlibm

Fdlibm license

Volk Meta loader for Vulkan API

MIT

Vulkan Deps

BSD

VulkanMemoryAllocator

MIT

Wasmparser

Apache

WebKit

BSD and LGPL v2 and LGPL v2.1

WebM container parser and writer.

BSD

WebP image encoder/decoder

BSD

WebRTC

BSD

Wuffs (Wrangling Untrusted File Formats Safely)

Apache 2.0

XNNPACK

BSD

Zstandard

BSD, GPLv2

cpuinfo

BSD

d3

BSD 3-Clause

dav1d is an AV1 decoder :)

2-Clause BSD

dynamic annotations

BSD

ffmpeg

LGPL 2.1

flac

BSD

fontconfig

MIT

google-glog's symbolization library

BSD

google-jstemplate

Apache 2.0

hunspell

MPL 1.1/GPL 2.0/LGPL 2.1

icu

MIT

inspector protocol

BSD

inspector protocol

BSD

intl-messageformat

New BSD

ipcz

BSD

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

libgav1

Apache 2.0

libpng

Libpng license

libsrtp

3-clause BSD

libvpx

BSD

libxml

MIT

libxslt

MIT

libyuv

BSD

mesa_headers

MIT and SGI Free Software B License Version 2.0

modp base64 decoder

BSD

opus

BSD

pthreadpool

BSD

re2 - an efficient, principled regular expression library

BSD 3-Clause

sql sqrt floor

Custom license

sqlite

Public domain

woff2

MIT

xdg-user-dirs

MIT

zlib

Zlib

Shader Tools

SPIRV-Cross, version 2d990d355a296ae1e368585810f884ebadcc4773

Apache License 2.0 and MIT Khronos - old variant

glslang, version 14.2.0

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

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.

© 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.