Licenses Used in Qt | Qt 6.4

- Qt 6.4
- Licenses Used in Qt
- Qt 6.4.1 Reference Documentation

# 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 6.4.1 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 1.2.12 | 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 3.2.0+e634f265db5d296bd7a780f9813d6b8573f5bd90 | 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 10.40 | BSD 2-clause "Simplified" License
PCRE2, version 10.40 | 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
TinyCBOR, version 0.6.0 | MIT License
Unicode Character Database (UCD), version 28 | Unicode License Agreement - Data Files and Software (2016)
Unicode Common Locale Data Repository (CLDR), version v41 | Unicode License Agreement - Data Files and Software (2016)
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
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 2.12.1 | Freetype Project License or GNU General Public License v2.0 only
HarfBuzz-NG, version 4.2.1 | MIT License
IAccessible2 IDL Specification, version 1.3.0 | BSD 3-clause "New" or "Revised" License
LibJPEG-turbo, version 2.1.4 | Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License and zlib License
LibPNG, version 1.6.38 | Libpng License and PNG Reference Library version 2
MD4C, version 0.4.8 | 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 1.2.166 | Apache License 2.0 or MIT License
Vulkan Memory Allocator, version 2.3.0 | 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 4.4.0 | Libtiff License
WebP (libwebp), version 1.2.4 | BSD 3-clause "New" or "Revised" License

## Qt Network

The Public Suffix List, version d17a65633b0286833727ef21e897a22564695ef5, fetched on 2022-05-23 | 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 1.1 | Mozilla Public License 2.0 and Creative Commons Zero v1.0 Universal and Creative Commons Attribution Non Commercial Share Alike 4.0 International and BSD 3-Clause "New" or "Revised" License and Apache License 2.0 and MIT License

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

## Qt QML

JavaScriptCore Macro Assembler | BSD 2-clause "Simplified" License

## Qt Quick 3D

Intel Embree, version 3.13.3 | Apache License 2.0
Open Asset Import Library, version 5.2.3 | BSD 3-clause "New" or "Revised" Licensee
ProceduralSky | MIT License
Tiny OpenEXR, version v1.0.1 | BSD 3-clause "New" or "Revised" 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 3.39.2 | 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 e225aedb5ec76ca6a0fe7079c0b84dbcbb490553 | Apache License 2.0
pfft, version 7c3b5a7dc510a0f513b9c5b6dc5b56f7aeeda422 | 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 3.14.0 | 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

## Shader Tools

SPIRV-Cross, version d137abeef57b2f3fdbdab0ad5590fe99a44ba546 | Apache License 2.0 and Khronos License
glslang, version 11.1.0 | 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 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.