Patent ID: 8051302
Filing Date: 2011-11-01
Classification: G06F,G11B,H04N

Abstract:
1. A distribution server for receiving encrypted content data and plain-text additional information data for obtaining decryption information data for use in decryption processing of the encrypted content data from a record medium bearing said encrypted content data and said plain-text additional information data, and distributing said decryption information data to a plurality of terminal devices each storing said decryption information data received over an information transmission network, comprising: a send/receive portion specified based on said plain-text additional information data, and coupled to said information transmission network to allow access from each of said terminal devices; and encrypting and distributing means for receiving a distribution request for said decryption information data sent from each of said terminal device and a first key sent from the data storing portion attached to said terminal device, encrypting said decryption information data with said first key, and distributing the encrypted decryption information data to the terminal device sending said distribution request via said send/receive portion and over said information transmission network.