Patent ID: 8190886
Filing Date: 2012-05-29
Classification: G06F,H04L,H04N

Abstract:
1. A revocation information transmission method used in a system including a plurality of transceiver devices for transmitting and receiving contents through a network, and a plurality of reproduction devices for reproducing the received contents, the method comprising the steps of: executing, by the transceiver devices, authentication of the plurality of reproduction devices, respectively, where each of the transceiver devices reads authentication information of a respective one of the reproduction devices; individually uploading, from each of the transceiver devices through the network to a revocation integrator device, revocation information indicating an authentication failure of a respective one of the individual reproduction devices; integrating, by the revocation integrator device, the revocation information uploaded from each of the transceiver devices as an integrated revocation list representing a common list of revocation information for each of the reproduction devices; packetizing the integrated revocation list and multiplexing the packetized revocation list into a stream; and transmitting the stream to the contents transceiver devices on the network; wherein each transceiver device utilizes, in the common list, other revocation information from other transceiver devices that previously uploaded revocation information to the revocation integrator device to: a) deny unauthorized reproduction devices from reproducing the content when the unauthorized devices are included in the common list, and b) allow authorized reproduction devices to reproduce the content when the authorized reproduction devices are not included in the common list.