Qt 5.15
Licenses Used in Qt
Qt 5.15.15 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 5.15.15 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 10.42	BSD 2-clause "Simplified" License
PCRE2, version 10.42	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 4e6c53ca9c667b74a7d332d1512d2c362af91516, fetched on 2023-07-31	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 2.13.0	Freetype Project License or GNU General Public License v2.0 only
HarfBuzz	MIT License
HarfBuzz-NG, version 7.2.0	MIT License
IAccessible2 IDL Specification, version 1.3.0	BSD 3-clause "New" or "Revised" License
LibJPEG-turbo, version 3.0.0	Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License and zlib License
LibPNG, version 1.6.40	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

Qt Image Formats

TIFF Software Distribution (libtiff), version 4.5.1	Libtiff License
WebP (libwebp), version 1.3.1	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 3.42.0

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

Wayland EGLStream Controller Protocol, version 1.1.1	MIT License
Wayland Fullscreen Shell Protocol, version unstable v1	MIT License
Wayland IVI Extension Protocol, version 1.9.1	MIT License
Wayland Linux Dmabuf Unstable V1 Protocol, version unstable v1, version 3	MIT License
Wayland Primary Selection Protocol, version 1	MIT License
Wayland Protocol, version 1.16.0	MIT License
Wayland Scaler Protocol, version 2	MIT License
Wayland Tablet Protocol, version unstable v2, version 1	MIT License
Wayland Text Input Protocol, version unstable v2	HPND License
Wayland Viewporter Protocol, version 1	MIT License
Wayland XDG Output Protocol, version unstable v1, version 3	MIT License
Wayland XDG Shell Protocol, version 1.18	MIT License
Wayland xdg-decoration Protocol, version unstable v1, version 1	MIT 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 and Boost Software License 1.0
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.