| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and method for controlling content use in accordance with content types of contents stored in a medium.SOLUTION: A playing apparatus holds a device certificate corresponding to an available content type according to content types, e.g., a high value-added content, such as a movie soon after being released to the public, and a normal content other than that. The playing apparatus discriminates the type of the content to be played selected by a user, and obtains a device certificate corresponding to the content type thereof according to the discriminated content type, to transmit to a medium. The medium confirms corresponding content type information recorded in the device certificate, and permits readout of a title key only if the title key that is an encryption key requested by the playing apparatus corresponds to a content matching the corresponding content type recorded in the device certificate. |
