Information delivery system, delivery center device, user...

Details Information delivery system, delivery center device, user... Information delivery system, delivery center device, user...

G - Physics

06

F

G06F 21/00 (2006.01)

Patent

CA 2620455

A user terminal device specifies presence or absence of additional recording in issuing a content request, and in the case of additional recording, the device transmits medium information and encrypted information of pre-recorded contents to a delivery center. When receiving a content additional recording request from the device, the delivery center decrypts once encrypted contents to be additionally recorded with the corresponding-content keys. The encrypted key information is decrypted by the medium information from the device to decrypt content keys of the pre-recorded contents and re-encrypts encrypted contents to be additionally recorded to deliver the re-encrypted contents to the device. When receiving contents for additional recording, the device records the received contents so as to be related to the pre-recorded contents, on a recording medium.

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