Content protection method, and information recording and reproduction apparatus using the same
A content and content key technology, which is applied in digital recording/reproduction, program/content distribution protection, secure communication devices, etc., can solve problems such as content editing cannot be realized, and achieve the effect of preventing copying and preventing content copying
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[0036] refer to figure 2 , a media ID 31 uniquely assigned to each medium and a media key block (MKB) 32 , which is uniquely assigned to each medium, are written in an area other than the user area as rewrite prohibition information in advance, and the media key block (MKB) 32 32 is used as device key invalid information. An encrypted state key 36 is also stored outside the user area, where the encrypted state key 36 is associated with Figure 6 and Figure 7 The encrypted state keys in 73 and 93 correspond. Encrypted title key invalidation information 33 is stored in a write area within the user area, and a title key 34 corresponding to stored content 35 is stored as content management information. The driver 40 has a device key 41 , and the content reproduction device, such as software 43 in a personal computer (PC), also has a device key 44 . Operation blocks 40, 45, and 46 correspond to figure 1 Operation blocks 22, 25 and 26 in .
[0037] First, the software 43 an...
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