A content delivery system headend is provided which includes a Switched Digital Video (SDV) manager for coordinating SDV sessions requested by subscribers over an access network. The headend also includes an input for receiving content to be broadcast during the SDV sessions and a subscriber control unit. The subscriber control unit is configured to compare channel change requests received by the SDV manager from subscribers to a current subscription plan that specifies a pre-established set of channels to which the subscriber has previously subscribed. In this way tuning information for accessing channels specified in the channel change requests is only supplied if the channel change requests request channels included in the current subscription plan.