Method and apparatus to control copying from a drive device to a data reproducing device
   
   

A data copy control method is applied to a computer system that has a reproducing device which receives reproducing data read out by a drive device. A shared key is produced in the drive device and the reproducing device. The reproducing data in the drive device is enciphered using copy control data read out by the drive device and the shared key. The enciphered reproducing data and the copy control data are transferred to the reproducing device. The enciphered reproducing data is deciphered using the copy control data received by the drive device and the shared key.

 
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