Patent ID: 7836514

Claim:
An apparatus for processing multimedia data, comprising: a transport stream (TS) input switch unit configured to receive a plurality of encrypted TS packets corresponding to a plurality of digital multimedia data signals; a packet identification (PID) filter unit configured to receive the plurality of TS packets from the TS input switch, and to output TS packets with PID and Service Channel Identification (SCID) values set in registers of PID filters of the PID filter unit; a first TS buffer configured to sequentially store the output TS packets; an external memory device configured to store at least some of the output TS packet; and a conditional access/content protection (CA/CP) unit configured to read and to decrypt the encrypted TS packets stored in the first TS buffer, and to encrypt at least some of the decrypted TS packets for storage in the external memory device if the first TS buffer becomes full, so as to prevent the decrypted TS packets to be stored in the external memory device from being copied.