| 摘要 |
According to the present invention, a method for managing an encryption key for a broadcasting service comprises the following steps: receiving, from a DRM agent, a message for requesting a rights object required for receiving content having at least one section; generating a pair of seed keys containing a first key and a second key, and applying hash chains with different directions to the first key and to the second key so as to generate at least one encryption key for each of said at least one section; and transmitting, to the DRM agent, a response message including a context element having an identifier of the content and a key information element, wherein said key information element includes a first encryption key element containing information on the encryption key; a rights encryption key information element containing information on the reference of a rights encryption key; and an encryption data element containing an encryption seed. |
