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 6.7.1 that incorporate code licensed under third-party open-source licenses:

Qt 3D

Dear ImGui - ProggyClean.ttf

MIT License

Dear ImGui - stb

MIT License or Public Domain

Dear ImGui, version v1.66b

MIT License

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

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 10.43

BSD 2-clause "Simplified" License

PCRE2, version 10.43

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 v44.1

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

Bitstream Vera Font, version 1.10

Bitstream Vera Font License

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 2.13.2

Freetype Project License or GNU General Public License v2.0 only

HarfBuzz-NG, version 8.3.0

MIT License

IAccessible2 IDL Specification, version 1.3.0

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

LibJPEG-turbo, version 3.0.2

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

LibPNG, version 1.6.43

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 4.6.0

Libtiff License

WebP (libwebp), version 1.4.0

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

Qt Multimedia

FFmpeg, version n6.1

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

boost

Boost Software License 1.0

libjpeg

Independent JPEG Group License

zlib

Zlib License

Qt Network

Qt OPC UA

Open62541, version 1.3.9

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

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

Custom license

libpng

Libpng license

zlib

Custom license

Qt Positioning

Qt QML

JavaScriptCore Macro Assembler

BSD 2-clause "Simplified" License

Qt Quick 3D

Qt Quick 3D Physics

NVIDIA PhysX SDK, version PhysX_4.1.2.29882248

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

Qt Quick Controls

Qt SQL

SQLite, version 3.45.3

Public Domain

Qt SVG

XSVG

Historical Permission Notice and Disclaimer - sell variant

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 7641e67977cf937c22849e2ef19fffa70269e562

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

Qt Test

Catch2, version 2.13.10

Boost Software License 1.0

Cycle

MIT License

Linux Performance Events, version 3.7

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

Valgrind, version 3.22.0

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

Qt WebEngine

AXE-CORE Accessibility Audit

MPL 2.0

Abseil

Apache 2.0

Alliance for Open Media Video Codec

BSD

Almost Native Graphics Layer Engine

BSD

Android Explicit Synchronization

Apache 2.0

BoringSSL

BSDish

Brotli

MIT

CRC32C

New BSD

Chromium License

BSD

CodeMirror 6

MIT

Compact Encoding Detection

Apache 2.0

Compact Language Detector v3

Apache 2.0

Crashpad

Apache 2.0

Dawn

Apache 2.0

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

Google Double Conversion

BSD

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

MIT

Highway: C++ library for SIMD

Apache 2.0

Lighthouse

Apache License 2.0

Material color utilities

Apache License 2.0

OTS (OpenType Sanitizer)

BSD

One Euro Filter

BSD

PDFium

BSD

PFFFT: a pretty fast FFT.

BSD-like

Perfetto

Apache2

Protocol Buffers

BSD

Recurrent neural network for audio noise reduction

BSD 3-Clause

Snappy: A fast compressor/decompressor

New BSD

The Chromium Project

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

The Incremental Distributed Point Functions library

Apache 2.0

V8 fork of fdlibm

Fdlibm license

Volk Meta loader for Vulkan API

MIT

Vulkan Deps

BSD

VulkanMemoryAllocator

MIT

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 and GPLv2

cpuinfo

BSD

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

harfbuzz-ng

MIT

hunspell

MPL 1.1/GPL 2.0/LGPL 2.1

icu

MIT

inspector protocol

BSD

ipcz

BSD

jsoncpp

MIT

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

sqlite

Public domain

woff2

MIT

xdg-mime

Academic Free License version 2.0 or LGPL v2

xdg-user-dirs

MIT

zlib

Custom license

Shader Tools

SPIRV-Cross, version sdk-1.3.261.0

Apache License 2.0 and Khronos License

glslang, version 13.0.0

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 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

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.