# NOTICE
openairplay2 is licensed under the MIT License (see `LICENSE`). This file
records third-party material and attributions. A fuller discussion, including
the verified upstream licenses and the FairPlay/DMCA caveats, is in
[`notes/licensing.md`](notes/licensing.md). **This is not legal advice.**
## Protocol reference — shairport-sync (MIT)
The AirPlay 2 protocol handling was developed with reference to
[shairport-sync](https://github.com/mikebrady/shairport-sync), © James Laird
and Mike Brady, MIT-licensed. Specifically: the buffered-audio block framing
and the ChaCha20-Poly1305 nonce/AAD construction were translated into Rust from
its source, and the `features` capability bitmask constant was taken from it.
shairport-sync's core is MIT; some components it bundles carry other licenses
(none of those were used here).
## FairPlay `fp-setup` tables — third-party, Apple-derived
`src/fairplay.rs` contains fixed FairPlay `fp-setup` response tables (four
142-byte tables and a 12-byte header) copied verbatim. **These are not original
to this project.** They are well-known reverse-engineered FairPlay interop
constants derived from Apple's proprietary FairPlay implementation, circulated
across many AirPlay receiver projects (shairport-sync, UxPlay, RPiPlay,
openairplay/airplay2-receiver).
Their legal status is governed by Apple's copyright and the DMCA anti-
circumvention provisions, **not** by this project's MIT license — the MIT grant
does not, and cannot, extend to this third-party Apple-derived data. They are
included solely to interoperate with Apple senders (to receive audio streamed
to your own device).
## Dependencies
Third-party Rust crates are under their own licenses (predominantly MIT /
Apache-2.0); see `Cargo.toml` and their respective repositories.