HTTPS POST to localtranscript.com/api/licence/activate when you enter a key; a daily heartbeat re-checks the licence while it's active. Fields: licence key, one-way hardware fingerprint, hostname hint, OS, app version, account email.
Free installs without a key send nothing here. Prefer fully offline? Activation also works by offline token paste, and enterprise installs can domain-activate. If the server is unreachable, a 90-day grace period applies.