Patent ID: 8510854
Filing Date: 2013-08-13
Classification: H04L

Abstract:
1. A digital rights management (DRM) method in a terminal, comprising: receiving, by a terminal DRM agent, a DRM content and a right object (RO); wherein the RO is issued by a right issuer (RI) in the name of a card DRM agent, and wherein the DRM content is issued by a content issuer (CI); requesting, by the terminal DRM agent from the card DRM agent, information on a right associated with the RO to use a particular content of the DRM, receiving, by the terminal DRM agent from the card DRM agent, a response to the request, the response including the information on the right associated with the RO, wherein the information includes state information for the right associated with the RO; decoding, by the terminal DRM agent, the particular content using the information on the right associated with the RO; transmitting, by the terminal DRM agent to the card DRM agent, each of a notification of a start of using the particular content, a notification of using the particular content, and a notification of a termination of using the particular content; wherein the state information indicates an amount of the particular content available for future use, and wherein each of the notifications are used by the card DRM agent to update the state information; and receiving, by the terminal DRM agent from the card DRM agent, a response to each of the notifications, wherein the state information is stored in a memory of a card DRM and is updated with respect to the RO by the card DRM agent according to each of the notifications.