Patent ID: 7747853

Claim:
A method for providing content from a head-end to a digital device, comprising: producing an Internet Protocol (IP) datagram including an IP header and a body that includes a plurality of packets in a Moving Picture Experts Group (MPEG) format, the plurality of packets including a first packet and a second packet preceding the first packet, the first packet including a first packet identifier to indicate a type of data stored in a payload of the first packet and the payload of the first packet is either video or audio encrypted using a first key, and a second packet including a secondary packet identifier to indicate that the second packet includes data that is (i) duplicative of the data contained in the payload of the first packet and (ii) encrypted differently than the data contained in the payload of the first packet, and to cause the digital device to discard the data contained in the first packet, the duplicative data being in a payload of the second packet and being either the video or the audio encrypted using a second key different than the first key; and transmitting the IP datagram from the head-end.