Managed-link knobs (paid B3 + C1/C1b, split for free accounts in C1d).

Two rules stack here.

WHICH KNOB (C1d): expiry and "viewers may copy" are free for any signed-in owner. An expiry is hygiene — anonymous links carry one anyway — and the copy switch is documented as a request rather than a barrier, so charging for it would be selling something we ourselves call unenforceable. A password IS enforced, a readable name claims a public namespace, and the view count grows with use: those three stay paid.

SETTING vs REMOVING (C1c): taking a paid knob off never needs the plan. Otherwise an account whose subscription lapses could not remove the password it set itself — one support case per cancellation.