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

Qt 3D

Assimp - Clipper, version 4.8.8

Boost Software License 1.0

Assimp - Open Asset Import Library, version 4.1.0

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

Assimp - Open3DGC

MIT License and BSD 2-Clause "Simplified" License

Assimp - Poly2Tri Polygon Triangulation Library

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

Assimp - RapidJSON

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

Assimp - The OpenDDL-Parser

MIT License

Assimp - Unzip, version 1.01e

Zlib License

Assimp - Utf8Cpp

Boost Software License 1.0

Assimp - Zip

Public Domain

Assimp - irrXML

Zlib License

Dear ImGui - ProggyClean.ttf

MIT License

Dear ImGui - stb

MIT License or Public Domain

Dear ImGui, version v1.66b

MIT 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

Data Compression Library (zlib), version 1.2.11

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 3.1.5

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

FreeBSD strtoll and strtoull, version 18b29f3fb8abee5d57ed8f4a44f806bec7e0eeff

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

MD4

Public Domain

MD5

Public Domain

PCRE2 - Stack-less Just-In-Time Compiler, version 10.36

BSD 2-clause "Simplified" License

PCRE2, version 10.36

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

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

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

The Public Suffix List, version f2cce86a42f38265c67caa32c6e0ff61793bb534, fetched on 2021-01-21

Mozilla Public License 2.0

TinyCBOR, version 0.6+patches

MIT License

Unicode Character Database (UCD), version 26

Unicode License Agreement - Data Files and Software (2016)

Unicode Common Locale Data Repository (CLDR), version v38

Unicode License Agreement - Data Files and Software (2016)

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

ANGLE Library, version chromium/3280

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

ANGLE: Array Bounds Clamper for WebKit

BSD 2-clause "Simplified" License

ANGLE: Khronos Headers

MIT License

ANGLE: Murmurhash

Public Domain

ANGLE: Systeminfo

BSD 2-clause "Simplified" License

ANGLE: trace_event

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

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

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

Freetype 2 - zlib

Zlib License

Freetype 2, version 2.10.1

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

HarfBuzz

MIT License

HarfBuzz-NG, version 1.7.4

MIT License

IAccessible2 IDL Specification, version 1.3.0

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

LibJPEG-turbo, version 2.0.6

Independent JPEG Group License

LibPNG, version 1.6.37

Libpng License and PNG Reference Library version 2

MD4C, version 0.4.6

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 1.0.39

MIT License

Vulkan Memory Allocator, version 2.2.0

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 4.2.0

Libtiff License

WebP (libwebp), version 1.2.0

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

Qt Location

Boost, version 1.65.1

Boost Software License 1.0

CSS Color Parser

MIT License

Clip2Tri Polygon Triangulation Library

MIT License

Clipper Polygon Clipping Library, version 6.4.0

Boost Software License 1.0

Earcut Polygon Triangulation Library

ISC License

Earcut, version 0.12.4

ISC License

Mapbox GL Native

BSD 2-clause "Simplified" License and zlib License

Optional

Boost Software License 1.0

Poly2Tri Polygon Triangulation Library

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

RapidJSON, version 1.1.0

MIT License

Vector Tile Library, version 1.0.2

ISC License

Wagyu Geometry Processing Library, version 0.4.3

MIT License

cURL Parse Date

MIT License

geojson-cpp, version 0.4.2

ISC License

geojson-vt-cpp, version 6.5.1

ISC License

geometry.hpp, version 0.9.3

ISC License

geosimplify-js polyline simplification library

Geosimplify-js License

kdbush.hpp, version 0.1.1-1

ISC License

nunicode, version 1.8

MIT License

polylabel, version 1.0.3

ISC License

protozero, version 1.5.2

BSD 2-clause "Simplified" License

shelf-pack-cpp, version 2.1.1

ISC License

supercluster.hpp, version 0.2.2

ISC License

tao_tuple, version 28626e99

MIT License

unique_resource, version cba309e

Boost Software License 1.0

variant, version 1.1.4

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

Qt OPC UA

Open62541, version 0.3

Creative Commons CCZero 1.0 Universal License

Open62541, version 1.0

Mozilla Public License 2.0

Qt Purchasing

Base64 Decoder

Apache License 2.0

In-app billing service

Apache License 2.0

Public Key Verification

Apache License 2.0

Qt QML

JavaScriptCore Macro Assembler

BSD 2-clause "Simplified" License

Qt Quick 3D

Open Asset Import Library, version 5.0.1

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

Qt Quick Controls

Qt SQL

SQLite, version 3.35.2

Public Domain

Qt SVG

XSVG

Historical Permission Notice and Disclaimer - sell variant

Qt Script

JavaScriptCore, version Snapshot from 2011-01-27

GNU Library General Public License v2 or later

Qt Test

Cycle

MIT License

Linux Performance Events, version 3.7

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

Valgrind, version 3.14.0

BSD 4-clause "Original" or "Old" License

Qt Virtual Keyboard

Lipi Toolkit, version 4.0.0

MIT License

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

ANGLE array bounds clamper from WebKit

BSD

ARCore SDK

Apache 2.0

ARCore SDK client library for Chrome

Apache 2.0

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

Blackmagic DeckLink SDK - Mac

BSL (v 1.0)

BoringSSL

BSDish

Breakpad, An open-source multi-platform crash reporting system

New BSD, Apple PSL 2.0 and Apache 2.0

Brotli

MIT

C++ port of zxcvbn, an advanced password strength estimation library.

MIT

CRC32C

New BSD

Chromium License

BSD

Chromium OS system API

BSD

CityHash

MIT

Closure compiler

Apache 2.0

Cocoa extension code from Camino

MPL 1.1/GPL 2.0/LGPL 2.1

Compact Encoding Detection

Apache 2.0

Compact Language Detector v3

Apache 2.0

Crashpad

Apache 2.0

Darwin

Apple Public Source License 2.0

Dawn

Apache 2.0

Emoji Segmenter

Apache 2.0

Expat XML Parser

MIT

Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives

MIT

FideltyFX Single Pass Downsampler

MIT

FlatBuffers

Apache 2.0

FreeType

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

Fuse.js

Apache License, Version 2.0

GVR Android SDK

Apache 2.0

GVR Keyboard

Apache 2.0

GifPlayer Animated GIF Library

Apache License 2.0

Google Closure Library

Apache 2.0

Google Double Conversion

BSD

Google Ink

Apache 2.0

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

MIT

IAccessible2 COM interfaces for accessibility

BSD

ISimpleDOM COM interfaces for accessibility

MPL 1.1/GPL 2.0/LGPL 2.1

Jinja2 Python Template Engine

BSD 3-Clause

Khronos header files

MIT/X11, SGI Free Software License B

Khronos reference front-end for GLSL and ESSL

MIT

LZMA SDK

Public Domain

LevelDB: A Fast Persistent Key-Value Store

New BSD

Lottie Web

MIT

Material Design Icons

Apache 2.0

Metrics Protos

BSD

NVidia Control X Extension Library

MIT

Nearby Connections Library

Apache 2.0

Netscape Portable Runtime (NSPR)

MPL 1.1/GPL 2.0/LGPL 2.1

Netwide Assembler

2-Clause BSD

Network Security Services (NSS)

MPL 2

OTS (OpenType Sanitizer)

BSD

Oculus SDK for Windows

By exception only

One Euro Filter

BSD

Open Screen Protocol Library

BSD

OpenCV

BSD

OpenH264

2-Clause BSD

PDFium

BSD

PFFFT: a pretty fast FFT.

BSD-like

PLY (Python Lex-Yacc)

BSD

PSM (Private Set Membership) client side

Apache Version 2.0

Paul Hsieh's SuperFastHash

BSD

Perfetto

Apache2

Polymer

BSD

Private Join and Compute subset

Apache 2.0

Protocol Buffers

BSD

QUICHE

BSD

Quick Color Management System

MIT

Recurrent neural network for audio noise reduction

BSD 3-Clause

SMHasher

MIT, Public Domain

SPIR-V Headers

MIT

SPIR-V Tools

Apache 2.0

SPIRV-Cross

Apache 2.0

Schema.org is a collaborative, community activity with a mission to

Creative Commons Attribution-ShareAlike 3.0 Unported

Secure Message

Apache 2.0

Shaderc

Apache 2.0

Shaka Player

Apache 2.0

Simple Homomorphic Encryption Library with Lattices

Apache Version 2.0

Skia

BSD

Snappy: A fast compressor/decompressor

New BSD

Strongtalk

BSD

Sudden Motion Sensor library

University of Illinois/NCSA Open Source License

SwiftShader

Apache 2.0 and compatible licenses

Text Fragments Polyfill

Apache 2.0

The Chromium Project

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

The USB ID Repository

BSD

Tint

Apache 2.0

UKey2

Apache 2.0

URI Template Parser

Apache 2.0

UnRAR source for decompressing .RAR and other files.

Non-standard

V8 JavaScript Engine

BSD

Vulkan API headers

Apache 2.0

VulkanMemoryAllocator

MIT

WDS

LGPL 2.1

Web Animations JS

Apache 2.0

WebKit

BSD and LGPL v2 and LGPL v2.1

WebM container parser and writer.

BSD

WebP image encoder/decoder

BSD

WebRTC

BSD

Weston - reference Wayland compositor

MIT "Expat"

Windows Template Library (WTL)

Microsoft Permissive License

Wuffs (Wrangling Untrusted File Formats Safely)

Apache 2.0

bspatch

BSD 2-Clause License

d3

BSD 3-Clause

dav1d is an AV1 decoder :)

2-Clause BSD

dom-distiller-js

BSD

dynamic annotations

BSD

fdlibm

Freely Distributable

ffmpeg

LGPL 2.1

flac

BSD

fontconfig

MIT

google-glog's symbolization library

BSD

google-jstemplate

Apache 2.0

harfbuzz-ng

MIT

hunspell

MPL 1.1/GPL 2.0/LGPL 2.1

hyphenation-patterns

MIT, MPL 1.1/GPL 2.0/LGPL 2.1, GNU Lesser Public License, Unicode License, Unicode Data License, custom notice license, custom permissive license

iccjpeg

Custom license

icu

MIT

inspector protocol

BSD

jsoncpp

MIT

libaddressinput

Apache 2.0

libavif - Library for encoding and decoding .avif files

2-Clause BSD

libbrlapi

LGPL 2.1

libevent

BSD

libgif codec for Skia

MPL-1.1/GPL-2.0/LGPL-2.1 + BSD-3-Clause + BSD-2-Clause

libipp

BSD

libjingle XMPP and xmllite libraries

BSD

libjpeg-turbo

Custom license

libpng

Libpng license

libprotobuf-mutator

Apache 2.0

libsecret

LGPL 2.1

libsrtp

3-clause BSD

libudev

LGPL 2.1

libusbx

LGPL 2.1

libvpx

BSD

libxml

MIT

libxslt

MIT

libyuv

BSD

linux-syscall-support

BSD

mesa_headers

MIT and SGI Free Software B License Version 2.0

minigbm

BSD

modp base64 decoder

BSD

nmoinvaz/minizip

Custom license

opus

BSD

pyjson5

Apache 2.0

pywebsocket3

New BSD

re2 - an efficient, principled regular expression library

BSD 3-Clause

simplejson

MIT

six

Apache License, Version 2.0

sqlite

Public domain

tcmalloc

BSD

test_fonts

SIL OPEN FONT LICENSE, GPL v2, Bitstream Vera Fonts Copyright

tlslite

Public domain and BSD

url_parse

BSD and MPL 1.1/GPL 2.0/LGPL 2.1

usrsctp

New BSD

v4l-utils

LGPL 2.1

valgrind

BSD

woff2

MIT

xdg-mime

Academic Free License version 2.0 or LGPL v2

xdg-user-dirs

MIT

xdg-utils

MIT

xxHash

BSD

zlib

Custom license

Qt XML Patterns

XML Schema, version 2007/08

W3C Software Notice and Document License (2015-05-13)

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

Notes about PDF Licensing

Details of restrictions on the use of PDF-related trademarks

The Active Qt framework

Commercial and BSD 3-clause "New" or "Revised" License.

The QtOpenGLExtensions Library

Commercial and BSD 3-clause "New" or "Revised" License.

The qtmain Library

Commercial and BSD 3-clause "New" or "Revised" License.

Trademarks

Information about trademarks owned by The Qt Company and other organizations.

© 2021 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.