| 摘要 |
PROBLEM TO BE SOLVED: To provide a data reproducing apparatus capable of utilizing an application that is verified, using an invalidated certificate even if the electronic certificate is invalidated by private key leakage. SOLUTION: Even if an electronic certificate is invalidated, a hash value of the certificate paired with an application identifier stored on an update disk is compared with a hash value computed from a certificate on a content disk to guarantee that the application is not a malicious application, thereby safely carrying out the application on the disk. COPYRIGHT: (C)2006,JPO&NCIPI
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