| 摘要 |
Simultaneous recording of a digital content, which does not specify Copy Free, on recording medium of the same type is not authorized. Therefore, when a content that has been recorded by a recording/reproducing apparatus is being reproduced by the recording/reproducing apparatus, the content cannot be reproduced from the recording medium by any other reproducing apparatus. Moreover, when any other reproducing apparatus is used for reproduction, the content has to be moved from the recording/reproducing apparatus to the recording medium. This is inconvenient. In the recording/reproducing apparatus, data is recorded on one dismountable recording medium after it is encrypted using a local encryption key so that the data can be accessed by the recording/reproducing apparatus which has recorded the data. On the other recording medium, the data is recorded after it is encrypted without employment of the local encryption key so that the data can be accessed by any other reproducing apparatus.
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