摘要 |
<p>An integrated receiver decoder (IRD) (37), commonly called a set-top box (37), has a global positioning system (GPS) receiver (44). The GPS receiver (44) checks to see if the IRD is as an authorized location and allows descrambling (46) of video signals only if the location is authorized. A central access control system (48), remote from the customers/viewers, has a high quality GPS receiver and sends some GPS data in the transmission medium used to send video signals to the customers. The set-top box (37), referred to as a customer access control, establishes different geographic restrictions on different of various video signals. Location-specific signals require that the set-top box be at a single fixed location for descrambling. Region-specific signals are accessible only if the set-top box (37) is in a geographic region authorized for reception, there being several such regions.</p> |