Patent ID: 9210383
Filing Date: 2015-12-08
Classification: H04L,H04N

Abstract:
1. A computer-implemented method of storing decryption key information, the method comprising: receiving entitlement control information for at least a subset of services, the subset of services including at least two services, the entitlement control information received in transport stream packets; receiving encrypted content for at least the subset of services separately from the entitlement control information, the encrypted content received in transport stream packets having a packet identifier different from packet identifiers associated with the entitlement control information; calculating, in advance of receiving a service change request, decryption key information for the subset of services from the entitlement control information; storing the decryption key information in machine memory; receiving the service change request, the service change request identifying a selected service of the subset of services; responding to the service change request by reading decryption key information for the selected service from the machine memory; and employing the selected decryption key information to decrypt the encrypted content for the selected service.