| 摘要 |
At the time of manufacturing a DVD to be provided to a rental agent, provider device 20 writes agent-rental expiry END2 along with a contents onto the DVD. At the time of renting the DVD to a user, rental agent device 30 writes user-expiry END1 onto the DVD. DVD player 40 acquires current time NOW form time source device 50, and compares current time NOW with each of prior time OLD, agent-rental expiry END2, and user-rental expiry END1. Only when playback conditions are met, DVD player 40 plays back the content.
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