| 摘要 |
PROBLEM TO BE SOLVED: To provide a constitution which improves efficiency of checking of contents alteration in a data processor for contents utilization. SOLUTION: In the constitution which generates the inspection value of the contents to be stored in a storage device, stores the value after correlating it with the contents and checks the presence/absence of the contents alteration with the inspection value, the inspection value is generated and stored by each category of the contents. The category is set on the basis of the management entity, etc., of an affective key block (EKB) provided by encoding a contents key Kcon set as the kind of the contents or the encoding processing key of the contents, thereby the inspection processing of contents data can independently be carried out by each management entity of the block (EKB), e.g. and efficient processing is realized. |
