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    1.
    发明专利
    未知

    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.

    2.
    发明专利
    未知

    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.

    DATA RECORDING / REPRODUCING DEVICE
    3.
    发明专利
    DATA RECORDING / REPRODUCING DEVICE 未知

    公开(公告)号：MY123020A

    公开(公告)日：2006-05-31

    申请号：MYPI9904360

    申请日：1999-10-08

    Applicant: PANASONIC CORP

    Inventor： NONOMURA TOMOYUKI ,  INOUE MITSUHIRO ,  MINAMI MASATAKA ,  KOZUKA MASAYUKI

    IPC: G11B20/10 ,  G06F12/14 ,  G10L11/00 ,  G11B20/00 ,  H03M7/00

    Abstract: IN THIS INVENTION, AS SHOWN IN 1, A STREAM ATTRIBUTE DECISION MEANS (101) FOR DECIDING WHETHER AN AUDIO DATA STREAM SUPPLIED FROM THE OUTSIDE HAS BEEN COMPRESSED OR NOT IS PROVIDED, AND A COMPRESSION ID FLAG FCO HAVING A VALUE ACCORDING TO THE RESULT OF THIS DECISION IS ATTACHED TO THE AUDIO DATA STREAM, AND THE FLAG-ATTACHED AUDIO DATA STREAM IS WRITTEN IN THE STREAM STORAGE UNIT (L00B). THEREBY, AFTER A COMPRESSED AUDIO DATA STREAM FROM THE OUTSIDE IS READ FROM THE STREAM STORAGE UNIT, A WATERMARK CAN BE INSERTED INTO THE COMPRESSED AUDIO DATA STREAM. THEREFORE, THE TIME REQUIRED FOR WRITING THE COMPRESSED AUDIO DATA STREAM INTO THE STREAM STORAGE UNIT IS REDUCED, AND THE SOUND QUALITY OF ANALOG AUDIO DATA OBTAINED BY REPRODUCING THE COMPRESSED AUDIO DATA STREAM IS PREVENTED FROM BEING DEGRADED. 1

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