Patent ID: 6021197
Filing Date: 2000-02-01
Classification: H04N

Abstract:
Method for controlling the operation of a signal decoder in a broadcasting system, including the steps of generating a broadcast signal, generating an information table, adding said information table to said signal, generating an encrypted signature from the information in the information table and adding said signature to said signal, wherein said step of generating a broadcast signal includes generating a digital transport stream as a multiplex of a plurality of signal sources, wherein said information table includes identification and control data for the decoder wherein said digital transport stream includes a pay load part, broadcasting said signal with said signature, receiving said signal in said decoder, decrypting said signature, comparing the decrypted signature with information in the information table used as verification value and, if a match occurs, allowing the further operation of said decoder, and, if a match does not occur, disallowing further operation of said decoder.