# Attribution & licensing

**istrain-public is licensed GPLv3** (see [`LICENSE`](LICENSE)). This choice follows the
strongest dependency: the EOT decoder validates frames against **PyEOT**, which is GPLv3.

## Third-party code vendored here

- **`scripts/eot/PyEOT/`** — [PyEOT by Eric Reuter](https://github.com/ereuter/PyEOT), the
  open-source End-of-Train / FFSK decoder (packet parser + BCH check) and its demo recording.
  **GPLv3**, its `LICENSE` kept intact in that directory. Our `scripts/eot/eot_scan.py` calls
  into it at runtime for frame-sync and validity checking; the two-pass adaptive front-end
  (drift-tolerant tone tracking + fuzzy sync) is our addition.

## The shoulders this stands on

The tools and communities credited in the dashboard's **With Thanks** panel are the real
foundation — RTL-SDR Blog and the osmocom rtl-sdr tools, RTLSDR-Airband, faster-whisper /
OpenAI Whisper, FFmpeg, NumPy, Docker + Dockge, and the railfan frequency communities
(RadioReference, Railroad-Frequencies.com, the regional railfan sites) that publish the
channel plans that make any of this findable. See `dashboard/index.html` for the full list
with links.

## Note for the person who forked this

If you'd rather license your own build permissively (MIT/BSD), you can — **but not while
PyEOT is vendored and imported.** Swap in your own FFSK frame parser + BCH check (the spec is
public — 1200-baud FFSK, the SigidWiki EOTD page documents it), drop `scripts/eot/PyEOT/`, and
the GPL obligation goes with it. Everything else here is original work.