| 摘要 |
In a network for broadcast communication of digital information composed of image, audio etc., prior to the broadcasting of the digital information of which copying is limited, there is discriminated whether a recording device is present on the network and the output of the digital information is controlled according to the result of discrimination. If the recording device is present, the digital interface or the recording function of the recording device is so controlled that the broadcast digital information cannot be recorded. Thus, in case the digital information of which copying is limited is broadcast on the network, there can be prevented the unlawful copying or erroneous recording of such digital information.
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