Scramble release device for scrambled digital broadcasting streams in broadcasting communication convergence system

摘要

A complex scramble release device for a plurality of scrambled digital broadcasting streams and an optical subscriber network employing the complex scramble release device enables a user to watch all MPTSs provided in a system through only one set top box in a broadcasting communication convergence system. The system is capable of providing several MPTSs encrypted in ways varying by different types of broadcasters a includes a broadcast receiving unit for receiving MPTSs from an outside source, and transmitting PID information of the MPTS to a control section; a switch for receiving the MPTSs from the broadcast receiving unit, and switching scrambled MPTSs and MPTSs, which have not been scrambled; and a plurality of descramblers for descrambling the scrambled MPTSs from among the MPTSs switched by the switch. Subsequently, the descrambled MPTSs are output. A control section receives the PID information from the, broadcast receiving unit, and then controls the switch so that a MPTS, which requires a descrambling, can be switched to the descramblers.