# Copyright & Attribution

Chaptarr is free software, licensed under the **GNU General Public License, version 3**.
See the [LICENSE](LICENSE) file for the full license text. If you found and ran Chaptarr
from Docker Hub and would like a copy of the source code as required by this license,
please reach out on [Discord](https://discord.gg/nqFGsGUug2) and it will be sent to you.

## Copyright

- Copyright © 2026 Chaptarr contributors.
- Portions copyright © 2010–2026 the Servarr team and contributors.

Upstream copyright notices are preserved throughout the source code in accordance
with the GPL.

## Lineage & Attribution

Chaptarr is a fork of [Readarr](https://github.com/Readarr/Readarr), an eBook and
audiobook manager that is part of the [Servarr](https://wiki.servarr.com/) project
family. Readarr is built on the shared codebase behind
[Sonarr](https://github.com/Sonarr/Sonarr),
[Radarr](https://github.com/Radarr/Radarr),
[Lidarr](https://github.com/Lidarr/Lidarr), and
[Prowlarr](https://github.com/Prowlarr/Prowlarr).

Chaptarr would not exist without the years of work the Servarr team and their
contributors put into those projects. We are grateful for it.

## Not Affiliated With Servarr

Chaptarr is an independent, community-run project. It is **not affiliated with,
endorsed by, or supported by** the Servarr team or the Readarr, Sonarr, Radarr,
Lidarr, or Prowlarr projects. Please direct Chaptarr questions and support requests
to the Chaptarr project — not to them.

## AI Development Disclosure

Chaptarr is developed and maintained with the assistance of AI tools.

## Third-Party Components

Chaptarr's optional audiobook conversion shells out to external tools that are
bundled in the **official Chaptarr Docker image** — they are not part of this
source tree. Each remains under its own license:

| Component | License | Source |
|---|---|---|
| m4b-tool (by sandreas) | MIT | https://github.com/sandreas/m4b-tool |
| FFmpeg | LGPL-2.1-or-later (portions GPL, depending on build) | https://ffmpeg.org/ |
| mp4v2 | MPL-1.1 | https://github.com/enzo1982/mp4v2 |

m4b-tool is a PHP application and runs under the PHP runtime provided by the image.

## Trademarks

All product names, logos, and brands are the property of their respective owners.
Use of them does not imply any affiliation with or endorsement by them.