Importance

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Abstract

The disclosed invention effectively prevents fraudulent access to data whose usage is restricted to a time limit, such access attempted by manipulating the clock internal to a playback device and a terminal device. A nonvolatile memory device of the invention comprises a control circuit and a nonvolatile memory circuit which includes a storage region for restriction information to restrict access to contents information provided by web-based rental service. The restriction information includes access time limit information and access time stamp information. The control circuit performs an access decision action which comprises deciding whether access to the contents information is enabled or disabled, based on real time information which is supplied externally and the restriction information, and updating the access time stamp information to the real time information. The control circuit decides that access is disabled if the real time information is later than the access time limit given by the access time limit information or if the real time information is earlier than the access time stamp given by the access time stamp information; otherwise, the control circuit decides that the access is enabled. The control circuit performs the access decision action, at least, at the start of access to said contents information and at the end of the access.

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First Claim