This is the per-customer counterpart to channelAdminStatus: locking it disconnects all channels currently delivered to that customer and blocks further channel-join requests from them, while shuttingDown lets in-progress viewing finish before locking. Support staff use this to suspend an individual subscriber's video service, for example for non-payment, without touching any other customer or channel, and shuttingDown gives a way to end service gracefully rather than mid-stream. A billing system might automatically SET customerAdminStatus to locked(1) for a subscriber whose account is 30 days past due, instantly cutting their set-top box's video feed.