METHOD, DEVICE AND SYSTEM FOR RELATING ENTITIES FOR PROTECTING CONTENT TO EACH OTHER

摘要

PROBLEM TO BE SOLVED: To provide a method, device and system for relating entities for protecting contents to each other.

SOLUTION: This invention achieves a structure and a function for protecting broadcast contents, and provides a structure for protecting contents to be broadcast in the respective entities forming a broadcast network and thereafter transmitting the contents to a terminal, and the method for relating the entities to each other. The method includes steps of: performing a registration process of acquiring a group key by the terminal; requesting service participation by the terminal; and performing a service participation process of acquiring authorization information for the contents from a message by using the obtained group key.

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