| 摘要 |
<p>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.</p> |
