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3. DTCP?
[DTCP]
The Digital Transmission Content Protection Specification defines a cryptogrphic
protocol for protecting audio/video entertainment content from unauthorized
copying, intercepting, and tampering as it traverses digital transmission
mechanisms such as a high-performance serial bus that conforms to the IEEE
1394-1995 standard. Only legitimate entertainment content delivered to a source
device via another approved copy protection system (such as the DVD Content
Scrambling System) will be protected by this protection system.
[Three cryptographic Keys]
Authentication Key which is formed as a result of authentication and used to
protect the exchange keys.
Exchage Key which is used to set up and protect content streams.
Content Key which is used to encrpt the content being exchanged.
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