Appendix: licences and hand-off rules

THIRI is one engine with several front doors, and they are not all licensed the same way. This appendix says what you may do with each, and the rules we follow when other people’s sound or work passes through a THIRI project.

The THIRI pieces

Piece	Licence	What it means for you
The REST API at chords.thiri.ai	Pre-release developer terms, accepted when you create a key	Build and ship apps on it. The engine, endpoints and brand stay ours. No uptime guarantee yet.
@bluesprincemedia/thiri-mcp (the MCP server)	PolyForm Noncommercial 1.0.0 for recent releases; earlier releases MIT	Free for personal, research and non-commercial use. Commercial embedding of the server needs the MCP Commercial Licence, $1,200 a year. The LICENSE file in the version you install is authoritative.
thiri-meets-elk (the measurement harness and data)	MIT	Use the method, the scripts and the data however you like, with attribution.
thiri-meets-lyria (the Google experiments)	Apache-2.0 with NOTICE	Private at the time of writing; the licence applies when it opens.
The Csound agentic skill pack	Apache-2.0	Use and adapt the skills; keep the notice.
The THIRI engine itself (JavaScript canonical, C++ port)	Not published	Results are public, the API is key-gated, the derivation is sealed. Engine internals are not discussed in public without a written go-ahead.
The THIRI VST / HORN SXTN plugin	No public release yet	The Ableton install video shows the desktop path; a signed download is on the list.

Trademark: THIRI is a trademark of Blues Prince Media. We do not say “patent pending” anywhere, and neither should material that quotes us.

Third-party pieces inside our builds

Piece	Rule
Elk Audio Stomp SDK	Not public. Never publish its link, installer name or paths. Reproduction of the pedal work needs Elk’s devkit.
Sushi (Elk’s audio host)	AGPL. A commercial pedal needs a licence from Elk.
JUCE 8	AGPLv3 or commercial, dual-licensed. A shipped plugin needs the commercial licence or AGPL compliance.
Sonniss GDC bundles	Fine inside a mix or stems for a film; no raw redistribution; no use for model training.
Splice samples	Inside productions only; never in a corpus; never raw files handed off.
VSCO 2 Community Edition, Freesound CC0 items, Kenney packs, the uisfx set	CC0. Credit is a courtesy, not a condition.
Unity UI Audio Collection	MIT. Ship the notice.
World of Warcraft audio bundled in a third-party sound repo	Blizzard’s. Refused in code; never used.
Lyria RealTime output	Google’s terms; carries SynthID; regenerable from a seed.
Gemini and Stable Audio outputs	Google API terms; Stability Community License respectively.

Hand-off rules for a scored film

• The filmmaker receives the mix, the stems and the credits file. Never raw library files.
• Their films and their breakdown documents stay theirs; nothing of theirs is shown publicly without their written permission, and the page says so when it has it.
• Every delivery ships with a measured report: loudness, true peak, click count, sync per sound, key.
• Found sounds are credited per file in the package, with the source and the licence.

Hand-off rules for the pedal work

• Elk’s private materials and Elk staff names stay in private documents.
• Photographs of other people need their consent before they appear anywhere public.
• The measurements, the method, the port map and the figures are public, with the column labelled and the binary hashed.

Hand-off rules for research posts

• A number names its source. If two sources disagree, the post says so.
• Nothing derived from a fabricated figure is ever republished, even after correction.
• A negative result is published with the same care as a positive one; the measurement repo keeps the failed rows on purpose.