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    • 4. 发明授权
    • Digital data reproduction device
    • 数字数据再现装置
    • US06751321B1
    • 2004-06-15
    • US09064985
    • 1998-04-23
    • Takehisa KatoNaoki EndohKenji Shimoda
    • Takehisa KatoNaoki EndohKenji Shimoda
    • H04L900
    • G11B20/0021G11B20/00086G11B20/00224H04N5/765H04N5/775H04N5/913H04N9/8042H04N2005/91364
    • A source of MPEG2 video data is connected with a dedicated AV device or personal computer by means of an IEEE 1394 interface. A transmission unit in the source has an IEEE 1394 encryption unit and a sending I/F unit. A reception unit varies between the dedicated AV unit and the personal computer. In the reception unit of the dedicated AV device, a receiving I/F unit and a decryptor are integrally incorporated into one semiconductor chip and an MPEG2 decoder is incorporated into one semiconductor chip. In the reception unit of the personal computer, the receiving I/F unit is formed of one semiconductor chip, and the decryptor connected to the I/F unit through a bus, and the MPEG2 decoder are formed of one semiconductor chip. Thus, data before decryption will not appear on the bus, which prevents MPEG2 video data from being taken out of the computer for illegal copying purposes. In addition, the reception unit is made to have a different physical configuration depending on whether it is to be mounted in the dedicated AV device or the personal computer. This will prevent the reception unit (including the decryptor) of the dedicated AV device from being connected in the personal computer in place of its associated reception unit (excluding the decryptor).
    • MPEG2视频数据源通过IEEE 1394接口与专用AV设备或个人计算机连接。 源中的传输单元具有IEEE 1394加密单元和发送I / F单元。 接收单元在专用AV单元和个人计算机之间变化。 在专用AV设备的接收单元中,一个接收I / F单元和解密器被整合在一个半导体芯片中,并且MPEG2解码器被并入到一个半导体芯片中。 在个人计算机的接收单元中,接收I / F单元由一个半导体芯片形成,并且解码器通过总线连接到I / F单元,并且MPEG2解码器由一个半导体芯片形成。 因此,解密之后的数据不会出现在总线上,这样就不会将MPEG2视频数据从计算机中取出来进行非法复制。 此外,接收单元根据是否要安装在专用AV设备或个人计算机中而具有不同的物理配置。 这将防止专用AV设备的接收单元(包括解密器)代替其关联的接收单元(不包括解密器)连接在个人计算机中。