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

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 Image Formats

TIFF Software Distribution (libtiff), version 4.6.0

Libtiff License

WebP (libwebp), version 1.3.2

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 Quick Controls

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 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

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.