Patent ID: 8819722

Claim:
A system for encrypting multiple television channels, the system comprising: one or more processors; and a memory communicatively coupled with and readable by the one or more processors and having stored therein processor-readable instructions which, when executed by the one or more processors, cause the one or more processors to: designate a first television channel of a plurality of television channels to be protected via a first entitlement control message using a first encryption scheme, wherein the plurality of television channels are transmitted using a single transponder stream; designate a second television channel of the plurality of television channels to be protected via a second entitlement control message encrypted using a second encryption scheme while the first television channel of the plurality of television channels is protected using the first encryption scheme; and cause the first entitlement control message encrypted using the first encryption scheme and a second entitlement control message encrypted using the second encryption scheme to be transmitted to a plurality of television receivers, wherein: data from the first entitlement control message is used for descrambling of the first television channel by the plurality of television receivers, and data from the second entitlement control message is used for descrambling of the second television channel by the plurality of television receivers; wherein the processor-readable instructions, when executed by the one or more processors, cause the one or more processors to: after the television service provider has transmitted the first entitlement control message and the second entitlement control message: designate the first television channel of the plurality of television channels to be protected via a third entitlement control message encrypted using the second encryption scheme; designate the second television channel of the plurality of television channels to be protected via a fourth entitlement control message encrypted using the first encryption scheme while the first television channel of the plurality of television channels is protected using the second encryption scheme; and cause the third entitlement control message encrypted using the second encryption scheme and the fourth entitlement control message encrypted using the first encryption scheme to be transmitted, wherein: the third entitlement control message is used for decryption of the first television channel, and the fourth entitlement control message is used for decryption of the second television channel.