ClipmothClipmoth — Third-Party Licenses
Last updated: 2026-08-09 · Covers the Clipmoth Windows desktop app, the browser extensions, and clipmoth.com.
Clipmoth is built on open-source software. Some of it we merely use; one component — FFmpeg — we redistribute inside the Windows installer, and that carries obligations we are meeting on this page. If anything here is incomplete or wrong, tell us and we will correct it.
1. FFmpeg — GNU General Public License
The Clipmoth Windows app ships a copy of ffmpeg.exe alongside the application executable. It is used to merge and convert media after a download.
The build we distribute is a Windows build obtained from gyan.dev. Builds of this kind are compiled with libx264 and libx265, which are licensed under the GPL. The resulting binary is therefore distributed under the GNU General Public License, version 3 or later — not the LGPL.
- License text: GNU GPL v3
- Project: ffmpeg.org
Written offer of corresponding source
Because we distribute this binary, you have the right to its complete corresponding source code. You can obtain it in either of these ways:
- Upstream, directly. FFmpeg's source is published at ffmpeg.org/download.html and git.ffmpeg.org/ffmpeg.git. The source and build scripts for the specific Windows builds we redistribute are published by the builder at gyan.dev/ffmpeg/builds.
- From us. Email support@clipmoth.com with the Clipmoth version you have installed, and we will provide the complete corresponding source for the exact FFmpeg binary shipped in that release, at no charge beyond the cost of delivery. This offer is valid for as long as we distribute that release, and for at least three years thereafter.
How FFmpeg relates to Clipmoth's own code
Clipmoth does not link against the FFmpeg libraries. It launches ffmpeg.exe as a separate program and communicates with it over the command line and its standard output, exactly as a user typing the command would. The GPL obligations above apply to that bundled binary. Clipmoth's own source code is proprietary and is not published.
2. yt-dlp — The Unlicense
The Windows app also ships yt-dlp.exe, which performs extraction for the sites Clipmoth supports. yt-dlp is released into the public domain under The Unlicense.
- Project and source: github.com/yt-dlp/yt-dlp
3. Desktop app — frameworks and libraries
All of the following are used under permissive licenses (MIT, Apache-2.0, ISC, or a dual MIT/Apache-2.0 option). Their full license texts are available in each project's repository.
- Tauri 2 and its dialog, opener, process and updater plugins — MIT or Apache-2.0
- React 19 and React DOM — MIT
- i18next / react-i18next — MIT
- lucide-react — ISC
- Tailwind CSS 4, Vite — MIT · TypeScript — Apache-2.0
- Rust crates: serde, serde_json, reqwest, chrono, regex, uuid — MIT or Apache-2.0
Microsoft Edge WebView2 Runtime renders the app's interface. It is Microsoft's proprietary component, used under Microsoft's terms; we do not redistribute it.
4. clipmoth.com
- hls.js 1.5.20 — Apache-2.0. Used on the practice pages to play sample HLS streams. github.com/video-dev/hls.js
- Inter and Noto Sans JP — SIL Open Font License 1.1, served via Google Fonts
5. Browser extensions
The Chrome, Edge and Firefox extensions contain no third-party runtime code. Media detection, HLS playlist parsing and AES-128 decryption are our own implementation, and no code is loaded remotely at runtime.
6. Our own code and assets
Clipmoth's application code, interface, copy, logo and mascot artwork are © 2026 Clipmoth and are not open source. Nothing on this page grants a license to them. Product names and trademarks referenced above belong to their respective owners.
Contact
Licensing questions, source requests, or a correction to this page: support@clipmoth.com