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
Almost Native Graphics Layer Engine	BSD
Android Explicit Synchronization	Apache 2.0
BoringSSL	BSDish
Brotli	MIT
C++ Signal/Slot Library	Custom license
CRC32C	New BSD
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
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
Emoji Segmenter	Apache 2.0
Expat XML Parser	MIT
FP16	MIT
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives	MIT
FlatBuffers	Apache 2.0
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package	Custome license
Google Double Conversion	BSD
Headers for the Windows 10 WebAuthn API (webauthn.dll)	MIT
Highway: C++ library for SIMD	Apache 2.0
LevelDB: A Fast Persistent Key-Value Store	New BSD
Lighthouse	Apache License 2.0
Lighthouse i18n.js	Apache License 2.0
Lit	BSD-3
Lit	BSD 3-Clause
Marked	MIT
Material color utilities	Apache License 2.0
Metrics Protos	BSD
OTS (OpenType Sanitizer)	BSD
One Euro Filter	BSD
PDFium	BSD
PFFFT: a pretty fast FFT.	BSD-like
Perfetto	Apache2
Polymer	BSD
Protocol Buffers	BSD
Protocol Buffers (javascript)	BSD
Puppeteer Core	Apache-2.0
QUICHE	BSD
Recurrent neural network for audio noise reduction	BSD 3-Clause
Snappy: A fast compressor/decompressor	New BSD
Speech Dispatcher	GNU Lesser Public License
The Chromium Project	BSD 3-clause "New" or "Revised" 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
URL Pattern Library	MIT
V8 fork of fdlibm	fdlibm license
Volk Meta loader for Vulkan API	MIT
Vulkan Deps	BSD
VulkanMemoryAllocator	MIT
Wasmparser	Apache
WebKit	BSD and LGPL v2 and LGPL v2.1
WebM container parser and writer.	BSD
WebP image encoder/decoder	BSD
WebRTC	BSD
Wuffs (Wrangling Untrusted File Formats Safely)	Apache 2.0
Zstandard	BSD, GPLv2
d3	BSD 3-Clause
dav1d is an AV1 decoder :)	2-Clause BSD
ffmpeg	LGPL 2.1
flac	BSD
fontconfig	MIT
google-glog's symbolization library	BSD
google-jstemplate	Apache 2.0
harfbuzz-ng	MIT
hunspell	MPL 1.1/GPL 2.0/LGPL 2.1
icu	MIT
inspector protocol	BSD
inspector protocol	BSD
intl-messageformat	New BSD
ipcz	BSD
jsoncpp	MIT
libaddressinput	Apache 2.0
libavif - Library for encoding and decoding .avif files	2-Clause BSD
libavif - Library for extracting metadata from .avif files	2-Clause BSD
libevent	BSD
libgav1	Apache 2.0
libpng	libpng license
libsrtp	3-clause BSD
libvpx	BSD
libxml	MIT
libxslt	MIT
libyuv	BSD
mesa_headers	MIT and SGI Free Software B License Version 2.0
modp base64 decoder	BSD
opus	BSD
re2 - an efficient, principled regular expression library	BSD 3-Clause
sql sqrt floor	Custom license
sqlite	Public domain
woff2	MIT
xdg-user-dirs	MIT
zlib	Zlib

Upgrading from Qt 5 Chromium License

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