- Qt 6.10
- Qt WebEngine
- Qt WebEngine Licensing
- Qt 6.10.1 Reference Documentation

Upgrading from Qt 5 ◦ Chromium License

# Qt WebEngine Licensing

The Qt WebEngine module uses Chromium to provide most of its functionality. During the build process, Chromium becomes a part of the Qt WebEngine Core library. Therefore, when distributing Qt WebEngine, users need to comply to both the licenses of the Qt WebEngine part as developed under the Qt Project, as well as the licenses that are part of Chromium.

The Qt specific parts of the Qt WebEngine module are available under commercial licenses from The Qt Company. Alternatively, they are available under GNU Lesser General Public License v3.0, or GNU General Public License v3.0, or GNU General Public License v2.0.

The Chromium part contains code available under various licenses, with the most restrictive license being the GNU Lesser General Public License v2.1 (LGPL 2.1). For a full list, see Third-Party Licenses below.

## Complying with LGPL 2.1

The Qt Company allows commercial customers to distribute the source code of the Qt WebEngine module alongside the Qt WebEngine binaries, and allows recipients to customize and build Qt WebEngine from sources. This includes building and using such a modified Qt WebEngine with an application or system using an otherwise commercially licensed Qt.

The Qt Company also keeps the Qt specific parts of the Qt WebEngine module available under the GNU Lesser General Public License v3.0, or the GNU General Public License v3.0, or the GNU General Public License v2.0, even if WebEngine is released as part of a commercial-only Long-Term Support release (LTS, see also Long-Term Support releases).

## Third-Party Licenses

Third party licenses included in the sources as part of Chromium are found below.

Note: Any GPL licenses listed below are only used to access Linux system resources. The Qt WebEngine libraries and plugins does not link to nor distribute GPL binary code, and it does not affect users of Qt WebEngine.

@puppeteer/replay | Apache-2.0
@vscode/web-custom-data | MIT
AXE-CORE Accessibility Audit | MPL 2.0
Abseil | Apache-2.0
Acorn, a tiny, fast JavaScript parser written in JavaScript. | MIT
Alliance for Open Media Video Codec | BSD-2-Clause, Patent
Almost Native Graphics Layer Engine | BSD
Blackmagic DeckLink SDK - Mac | BSL-1.0
BoringSSL | MIT, BSD-3-Clause, OpenSSL, ISC, SSLeay
Brotli | MIT
C++ Signal/Slot Library | Ignorable
CRC32C | BSD-3-Clause
CSP Evaluator Core Library, a tool that allows developers to check if a Content Security Policy (CSP) serves as mitigation against XSS attacks | Apache
Chromium License | BSD
CityHash | MIT
CodeMirror 5 | MIT
CodeMirror 6 | MIT
Compact Encoding Detection | Apache-2.0
Compact Language Detector v3 | Apache-2.0
Crashpad | Apache-2.0
Dawn | BSD 3-Clause
Devtools-Frontend | BSD-3-Clause
Emoji Segmenter | Apache-2.0
Expat XML Parser | MIT
FP16 | MIT
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives | Apache 2.0
FlatBuffers | Apache-2.0
FreeType | FTL
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package | Custome license
Google Double Conversion | BSD-3-Clause
Headers for the Windows 10 WebAuthn API (webauthn.dll) | MIT
Highway: C++ library for SIMD | Apache-2.0
Ink | Apache-2.0
Ink Stroke Modeler | Apache-2.0
LevelDB: A Fast Persistent Key-Value Store | BSD-3-Clause
Libtess2 | SGI Free Software License B
Lighthouse | Apache License 2.0
Lighthouse i18n.js | Apache License 2.0
Lit | BSD-3-Clause
Lit | BSD-3
Marked | MIT
Material color utilities | Apache-2.0
Metrics Protos | BSD-3-Clause
OTS (OpenType Sanitizer) | BSD-3-Clause
One Euro Filter | BSD-3-Clause
PDFium | BSD
PFFFT: a pretty fast FFT. | pffft
PSM (Private Set Membership) client side | Apache-2.0
Paul Hsieh&#x27;s SuperFastHash | BSD-3-Clause
Perfetto | Apache2
Polymer | BSD-3-Clause
Protocol Buffers | BSD-3-Clause
Protocol Buffers (javascript) | BSD-3-Clause
Puppeteer Core | Apache-2.0
QUICHE | BSD-3-Clause
Recurrent neural network for audio noise reduction | BSD-3-Clause
SPIR-V Headers | Apache-2.0
SPIR-V Tools | Apache-2.0
Search Engines resources | BSD-3-Clause
Simple Homomorphic Encryption Library with Lattices | Apache-2.0
Snappy: A fast compressor/decompressor | BSD-3-Clause, CC-BY-4.0, MIT, CC-BY-3.0
The Chromium Project | BSD 3-clause &quot;New&quot; or &quot;Revised&quot; License
The Diff Match and Patch libraries offer robust algorithms to perform the operations required for synchronizing plain text. | Apache License 2.0
The Incremental Distributed Point Functions library | Apache-2.0
URI Template Parser | Apache-2.0
URL Pattern Library | MIT
V8 fork of fdlibm | SunPro
Vulkan API headers | Apache-2.0
Vulkan Loader Components | Apache-2.0
VulkanMemoryAllocator | MIT
Wasmparser | Apache
Web Vitals | Apache
WebKit | BSD and LGPL v2 and LGPL v2.1
WebM container parser and writer. | BSD-3-Clause, Patent
WebP image encoder/decoder | BSD-3-Clause, Patent
WebRTC | BSD
Wuffs (Wrangling Untrusted File Formats Safely) | Apache-2.0
Zstandard | BSD-3-Clause
cpuinfo | BSD-2-Clause
d3 | ISC
dav1d is an AV1 decoder :) | BSD-2-Clause
fast_float | MIT
ffmpeg | LGPL 2.1
fft | Custom license
flac | BSD
harfbuzz-ng | MIT-Modern-Variant
hunspell | MPL-1.1
icu | MIT
inspector protocol | BSD-3-Clause
inspector protocol | BSD
intl-messageformat | New BSD
ipcz | BSD
json5 | MIT
jsoncpp | JsonCPP
libaddressinput | Apache-2.0
libavif - Library for encoding and decoding .avif files | BSD-2-Clause, MIT
libgav1 | Apache-2.0
libjpeg-turbo | IJG, BSD-3, Zlib
libpng | Libpng-2.0, Libpng
libsrtp | 3-clause BSD
libusbx | LGPL-2.1
libvpx | BSD-3-Clause, Patent
libxml | MIT
libxslt | X11
libyuv | BSD
mesa_headers | MIT, SGI-B-2.0
modp base64 decoder | BSD-3-Clause
opus | Opus-Patent-BSD-3-Clause
rapidhash | BSD-2-Clause
re2 - an efficient, principled regular expression library | BSD-3-Clause
simdutf unicode transcoder | MIT
spl sqrt floor | SPL-SQRT-FLOOR
sqlite | blessing
third-party-web | MIT
woff2 | MIT
zlib | Zlib

Upgrading from Qt 5 ◦ Chromium License