Key management system for DVD copyright management

摘要: A cryptographic system and method for secure distribution management of keys use in a DVD copy protection scheme is disclosed. disc having compressed, encrypted content written on first portion the disc, encryption key, itself with second key out band used to provide content, control information drive according present invention. The coupled decompressor video controller. controller engage handshaking protocol which all communication between them encrypted. After verifying that registered not known be compromised, passes controller, decompressor. decompressed by communicated where it decrypted converted signals. instructs as whether an optional analog should applied signals prior delivering display.