- Qt 5.15
- Licenses Used in Qt
- Qt 5.15.12 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 5.15.12 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
Open Asset Import Library, version 5.0.1 | BSD 3-clause "New" or "Revised" Licensee

## 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 1.2.13 | 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 10.40 | 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
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 d17a65633b0286833727ef21e897a22564695ef5, fetched on 2022-05-23 | 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 v39 | 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 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 | 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 2.1.4 | Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License and zlib License
LibPNG, version 1.6.39 | 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 1.0.39 | 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
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 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 Purchasing

Android Billing API Library | Apache License 2.0
AndroidX Annotation Library | Apache License 2.0
Base64 Decoder | 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

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 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
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 XML Patterns

XML Schema, version 2007/08 | W3C Software Notice and Document License (2015-05-13)
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.