Patent ID: 8626842

Claim:
A content transaction management server device comprising: storage configured to store a decryption key used for decryption of encrypted content data; a communication unit configured to communicate information; and a controller in communication with said storage, wherein said storage includes instructions on a non-transitory computer readable medium, the instructions, when executed, perform: receiving a payment request through the communication unit, the payment request including a first storage address and a user identifier, the first storage address indicating a storage area in the storage in which the decryption key is stored, the user identifier identifying a user, who is a purchaser of the encrypted content data; performing payment-procedure processes related to a transaction for purchase of the encrypted content data by the user identified by the user identifier included in the payment request; transmitting the decryption key through the communication unit to a transmission source of the payment request, after the payment-procedure processing is completed, the transmitted decryption key being read out from the storage area in the storage, the storage area being indicated by the first storage address included in the payment request; receiving, through the communication unit, content data and a second storage address indicating a storage area of an external device; generating encrypted content data by applying a predetermined encryption key to the received content data; controlling the storage to store a decryption key that is a counterpart of the encryption key used in the encryption; and transmitting a definitions file and the encrypted content data, through the communication unit to a transmission source of the content data and the second storage address, the definitions file including the first storage address indicating the storage area where the decryption keys are stored and the second storage address.