Cepther / Credits and licences
Credits and licences
The projects that help make Cepther possible.
Open source projects
Built with shared work
Thank you to the people who build and maintain these tools. Cepther brings them together in a Windows interface.
Download engines
First time setup downloads the required engines. Their original projects and licences are listed below.
| Project | What it does here | Licence |
|---|---|---|
| yt-dlp | Site extraction, format listing, metadata, the actual downloading | Project licence |
| FFmpeg | Merging video and audio, converting, embedding art and subtitles, trimming | Project licence |
| ffprobe | Reading media properties such as duration and stream layout | Project licence |
| aria2 | Multi connection download acceleration | Project licence |
| gallery-dl | Image and gallery sites | Project licence |
| whisper.cpp | Optional local speech recognition for AI subtitles | Project licence |
| Deno | Runs the JavaScript challenges some sites require | Project licence |
Built with
| Project | What it does here | Licence |
|---|---|---|
| Python | The language the whole app is written in | Project licence |
| PyQt6 | The interface: every window, panel and control | Project licence |
| PyQt6-WebEngine | The built in browser used to create cookie files | Project licence |
| windows-toasts | Actionable Windows notifications | Project licence |
| uiautomation | Reading the active browser address for the floating dock | Project licence |
| SQLite | History, presets and the Creator Watch list | Project licence |
Data sources
- SponsorBlock supplies the community submitted segment data used to cut sponsor reads and intros. See the project for its current data licence and usage terms.
Licensing can depend on the build, especially for FFmpeg and executable distributions. The project links describe their terms; consult the notices for the specific files you use.
What this means for you
- Every engine listed above keeps its own licence. Nothing here relicenses anybody’s work.
- Refer to each project’s licence and the notices accompanying the specific build you use.
- Several of these are copyleft. If you redistribute Cepther together with them, those terms follow the copy you pass on.
- Please report any missing or incorrect attribution.
Thank you
Thank you to the maintainers and contributors of the projects listed here.
Website imagery
The background uses the website’s original gradients and stars, animated locally in your browser.
Icons and type
- This site uses the Cepther mark and inline interface icons.
- Type is set in the system interface font on whatever machine is displaying it, so it always matches the rest of your desktop.
Something credited wrongly?
Let us know in the community Discord.