| http://www.w3.org/ns/prov#value | - In a step ST15, the consumer 1 a specifies personal information such as a member's number and payment information such as a payment method, while using the authentication image of FIG. 10 sent as the authentication request, to log-in to the server 31 a of the digital content retailer 3 a, the personal information and the payment information specified by the consumer 1 a are sent to the server 31 a
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