Patent ID: 6978256

Claim:
A computer implemented method of selling digital contents, comprising the steps performed by a computer of: receiving as an input to said computer identification information of digital contents selected by a customer; confirming that a payment of a charge for said digital contents selected by the customer is completed; generating digital contents by setting identification information for identifying said customer and information for indicating a complete payment confirmation of the charge for said selected digital contents in said selected digital contents as status information for permitting said customer to replay said selected digital contents; selling said generated digital contents as an output from said computer to said customer, wherein said identification information of said digital contents, identification information of said customer and identification information of a sales staff are read by a device for selling said generated digital contents, authenticating a sales staff who confirms the payment of the charge for said selected digital contents; and recording identification information of said sales staff who confirms the payment of the charge for said selected digital contents, wherein in said confirming step, a payment confirmation from said sales staff is input, and wherein said recording of identification information of said sales staff is used to prevent unauthorized processing of said digital contents by said sales staff.