公开(公告)号：DE60043036D1

公开(公告)日：2009-11-12

申请号：DE60043036

申请日：2000-05-26

Applicant: PANASONIC CORP

Inventor： TAGAWA KENJI ,  MATSUSHIMA HIDEKI ,  HIROTA TERUTO ,  ISHIKAWA TOMOKAZU ,  INOUE SHINJI ,  KOZUKA MASAYUKI

IPC: G11C7/00 ,  G06F3/16 ,  G11C7/16 ,  H04N1/21

Abstract: A semiconductor memory card stores a plurality of audio objects (AOBs) that compose a plurality of tracks and playlist information showing a reproduction order for the tracks. The semiconductor memory card also stores, as resume information (PLMG_RSM_PL), (1) a Playlist_Number showing which playlist information was used the last time playback was performed for the semiconductor memory card, (2) a Track_Number showing the last track to be played back, and (3) a Playback_Time showing a position at which where playback was stopped as a time expressed in relation to the start of the track.

公开(公告)号：DE69940365D1

公开(公告)日：2009-03-19

申请号：DE69940365

申请日：1999-10-07

Applicant: PANASONIC CORP

Inventor： TAGAWA KENJI ,  MINAMI MASATAKA ,  KOZUKA MASAYUKI ,  AOYAMA SHOICHI ,  TOKUDA KATSUMI ,  HIRATA NOBORU

IPC: G11B20/10 ,  G06F1/00 ,  G11B20/00 ,  H04N5/913 ,  H04N7/167 ,  H04N7/26

Abstract: A recording medium stores a retail content and a superdistribution content that is encrypted according to a block cryptosystem. A superdistribution header is attached to the superdistribution content and encrypted according to a public key cryptosystem. The superdistribution header contains a decryption key used to decrypt the block cryptosystem. The public key cryptosystem is characterized by using a device connected to a communication network for decryption. The decryption is performed when the recording medium is loaded into the device with a fee being charged via the communication network.

公开(公告)号：BR0006882B1

公开(公告)日：2014-03-18

申请号：BR0006882

申请日：2000-05-24

Applicant: PANASONIC CORP

Inventor： HIROTA TERUTO ,  TAGAWA KENJI ,  MATSUSHIMA HIDEKI ,  ISHIKAWA TOMOKAZU ,  INOUE SHINJI ,  KOZURA MASAYUKI

IPC: G06F12/14 ,  G11C7/00 ,  G06F1/00 ,  G06F3/06 ,  G06F3/08 ,  G06F3/16 ,  G06F12/00 ,  G06F21/24 ,  G06K17/00 ,  G06K19/00 ,  G06K19/07 ,  G06K19/073 ,  G10K15/04 ,  G10L19/00 ,  G11B20/10 ,  G11B20/12 ,  G11B27/00 ,  G11C7/16 ,  H04L9/08 ,  H04L9/10 ,  H04N1/21

Abstract: An audio stream is divided into a plurality of audio object (AOB) files that are recorded having each been encrypted using a different encryption key. At least one piece of track management information (TKI) is provided corresponding to each track. Playlist information (PLI) assigns a playback position in a playback order to each track when a plurality of tracks are to be played back one after the other.

公开(公告)号：DE69940281D1

公开(公告)日：2009-02-26

申请号：DE69940281

申请日：1999-07-21

Applicant: PANASONIC CORP

Inventor： TAGAWA KENJI ,  MINAMI MASATAKA ,  KOZUKA MASAYUKI

IPC: G11B20/00

Abstract: A digital data recording apparatus for recording digital data on a recording medium, comprises: communication means (100) for receiving encrypted digital data via a digital network; decryption means (105) for decrypting the encrypted digital data that has been received by the communication means; encryption means (110) including a plurality of encryption units (111,112,113) that re-encrypt digital data that has been decrypted by the decryption means in encryption systems having different security levels; recording means (115) for recording digital data that has been re-encrypted by the encryption means on the recording medium; designation reception means (117) for receiving, from a user, an instruction regarding designation of one of the plurality of encryption units, the designation encryption unit being for re-encrypting the digital data that has been decrypted by the decryption means; and a controller (109) for controlling the decryption means, the encryption means and the designation reception means, characterised in that the controller has the designated encryption unit re-encrypt the digital data that has been decrypted by the decryption means.