DATA REPRODUCTION APPARATUS CAPABLE OF SAFELY CONTROLLING REPRODUCTION TIME OF ENCRYPTED CONTENT DATA AND DATA REPRODUCTION CIRCUIT AND DATA RECORDING APPARATUS USED FOR THE SAME

摘要

When the elapsed time does not exceed the holding time of the reproduction control information (ACp), a license key (Kc) for decoding encrypted content data is continuously used and when the elapsed time exceeds the holding time, the license key (Kc) is discarded and a license key is acquired from a memory card (110) within a range of the possible number of outputs. Thus, it is possible to safely control the reproduction time of the encrypted content data.