Patent ID: 7631361
Filing Date: 2009-12-08
Classification: G06F,G11B,H04L

Abstract:
1. A content reproduction system for distributing a plurality of prepaid contents via a network, the content reproduction system comprising: a recording medium; a content distribution apparatus; and a reproduction apparatus, wherein the recording medium is operable to store, in association with each other, (i) identification information for identifying a plurality of contents that can be acquired, (ii) a master key that is common to the plurality of contents, and (iii) rule information that indicates a use rule that is common to the plurality of contents, wherein the content distribution apparatus includes: wherein the reproduction apparatus includes: wherein the recording medium is insertable into the reproduction apparatus and removable from the reproduction apparatus, wherein the recording medium stores the master key as an encrypted master key generated by encrypting the master key using a device key uniquely assigned to the reproduction apparatus, and wherein the reading unit acquires the master key by decrypting the encrypted master key using the device key uniquely assigned to the reproduction apparatus.