| 摘要 |
PROBLEM TO BE SOLVED: To provide a contents information transmission method, the recording method, transmitter, recorder, transmission medium and recording medium that can properly reproduce (decode) encrypted contents information under only regular limitations. SOLUTION: The method adopts transmission or recording of encrypted contents information, resulting from encrypting contents information by using a 1st key generated from source information of the 1st key, source information of an encrypted 1st key resulting from encrypting source information of the 1st key, by using a 2nd key generated from source information of the 2nd key, and source information of a transmission key generated from the 2nd key source information and another set of information or more by means of a prescribed function. |
