| 摘要 |
A content delivery apparatus delivers, to an information processing device, content data reproducible within an effective period. The content delivery apparatus includes a payment information acquiring unit that acquires information concerning a state of payment that is from a user of the information processing device and for a fee for delivery of the content data; a temporary authentication information sending unit that sends, to the user without using a communication line, temporary authentication information to temporarily extend the effective period, when the information acquired by the payment information acquiring unit indicates that the payment of the fee has been made; and a formal authentication information sending unit that sends, to the information processing device by using the communication line, formal authentication information to formally extend the effective period, when the information acquired by the payment information acquiring unit indicates that the payment of the fee has been made.
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