| 摘要 |
A system for preventing unauthorized copying of recorded information has a number of independently identifiable storage media holding the information in encrypted form and a number of drives for the storage media, the drives each having a key which decrypts the information on at least one of the storage media. The drives are in communication with a host computer which compares the identities of the storage media with each other and with an authorized list of identities. Should an identity be unauthorized or duplicated, indicating unauthorized copying, the host computer can send a message to the corresponding drive that disables either that drive or the storage medium having that identity. The host computer periodically revises the encryption codes of the control and storage media that are authorized and not duplicated.
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