Patent ID: 7376829
Filing Date: 2008-05-20
Classification: G11B,H04L,H04N

Abstract:
1. A terminal for receiving and retransmitting information, the terminal including: a first network adapter configured to receive in a first format a primary data stream in which the information has been encoded and encrypted according to a key scheme from a primary transmitter through a first network, an arrangement configured to receive entitlement messages, enabling an authorised receiver to decrypt the encrypted data stream; and at least one further network adapter for connection to a secondary network, wherein the terminal is configured to retransmit at least part of the information in at least one secondary data stream in a second format, differing from the first format, through the second network to at least one secondary terminal connected to the secondary network, wherein the terminal is configured to transmit the at least one secondary data stream encrypted according to the same key scheme and to forward received entitlement messages that enable an authorised receiver to decrypt the at least one secondary data stream to the at least one secondary terminal; and wherein the terminal is arranged to decrypt the received primary data stream and to encrypt the at least one secondary data stream according to the key scheme; and wherein the terminal is further arranged to de-multiplex a decrypted data stream comprising multiple elementary data streams, and to retransmit information encoded in only a subset of the elementary data streams to the at least one secondary terminal over the secondary network.