A recording medium including at least a lead-in region, a recording region in which information is recorded, and a lead-out region. In this configuration, medium information including medium identification information and relevant information is recorded in at least any one of the lead-in region, the recording region, and the lead-out region.

 
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< Processor for encrypting and/or decrypting data and method of encrypting and/or decrypting data using such a processor

> Microprocessor with improved task management and table management mechanism

> Network authentication system using individual services providers and an authentication server
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