AGPLv3 — the whole thing, no exceptions

Self-host it, fork it, run it as a service — the license terms are the same for everyone, including us. There's no separate commercial edition and nothing held back behind a paid tier: the code you can read is the code that runs.

AGPLv3's network-use clause means that if you modify Cairn OBS and offer it to others over a network — including as a hosted service — you're required to make your modified source available to those users too. That's a deliberate choice, not an oversight: it's the same protection that keeps this project itself safe from being taken closed-source downstream.