Patent ID: 7269741
Filing Date: 2007-09-11
Classification: G06F

Abstract:
1. A recording apparatus for writing an encrypted content to a user data area of a semiconductor memory card, the semiconductor memory card including: an authentication circuit for authenticating an apparatus to which the semiconductor memory card is connected; and a protected area which is accessed by the apparatus only when the apparatus has been authenticated by the authentication circuit, said recording apparatus comprising: an authenticating unit operable to perform mutual authentication with the authentication circuit of the semiconductor memory card; a reading unit operable to read the file condition management file from the protected area in the semiconductor memory card in a case of legitimacy being authenticated by the mutual authentication; a specifying unit operable to specify, from among the plurality of entry set files recorded in the protected area of the semiconductor memory card, an entry set file in the first condition by referring to the file condition information in the read file condition management file, and acquire entry condition information in the specified entry set file; a writing unit operable to write one of a decryption key and rights management information that both relate to the encrypted content, to an entry area corresponding to the off-flag, from among the plurality of entry areas in the specified entry set file; and an updating unit operable to update the file condition management file in the protected area of the semiconductor memory card so as to show an entry set file as being in the second condition if all the entry areas therein become in use as a result of the writing of the data by said writing unit.