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 5.0.1

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 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 Core

BLAKE2 (reference implementation), version 3d6155ab1682e68c30f93064f988247508f55bbe

Creative Commons Zero v1.0 Universal or Apache License 2.0

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

KWin, version 5.13.4

BSD-3-Clause

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 10.36

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

SipHash Algorithm

Creative Commons Zero v1.0 Universal

The Public Suffix List, version f8247fa33109a86679b1c8edb109542b85851110, fetched on 2020-11-05

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)

extra-cmake-modules, version 5.50.0

BSD-3-Clause

extra-cmake-modules, version 5.50.0

BSD-3-Clause

extra-cmake-modules, version 5.50.0

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

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-NG, version 2.6.4

MIT License

IAccessible2 IDL Specification, version 1.3.0

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

LibJPEG-turbo, version 2.0.5

Independent JPEG Group License

LibPNG, version 1.6.37

Libpng License and PNG Reference Library version 2

MD4C, version 0.4.7

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 4.1.0

Libtiff License

WebP (libwebp), version 1.1.0

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

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 3.34.0

Public Domain

Qt SVG

XSVG

Historical Permission Notice and Disclaimer - sell variant

Qt Test

Catch2, version 2.11.1

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 3.14.0

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

Qt Wayland Compositor

Shader Tools

SPIRV-Cross, version c5f7b55756886a2e78cbc2e7a40e8091e17f6310

Apache License 2.0 and Khronos License

glslang, version 07e1a0a67aee5b21561bd6b93d73c8d87e010d98

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 NVIDIA 2002 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

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 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.