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The DISC STRUCTURE Data Length value does not include the DISC STRUCTURE Data Length field itself. The Total Packs field reports the total number of MKB Packs that are available for transfer to the host, which is calculated by dividing total MKB data length by 32,768 with counting fractions as one. The Address field in the command specifies which of the available MKB Packs shall be read. The first MKB Pack shall be addressed as MKB Pack number 0000000016 and the nth MKB Pack shall be addressed as MKB Pack number n-1.

Until such time, the BEC bit will be set to 02. • A 2-byte Length of the certificate data including signature. • A 6-byte unique Drive ID. • A 40-byte Drive Public Key. • A 40-byte Signature Data (Drive_Certsig), that is to be verified by using the AACS_LApub. AACS_Verify(AACS_LApub, Drive_Certsig, Drive_Cert) where Drive_Certsig is Byte 52 through Byte 91 of the Drive Certificate and Drive_Cert is Byte 0 through Byte 51 of the Drive Certificate. 2 Host Certificate AACS licensed PC host must have the AACS_LApub, a Host Certificate and a Host Private Key in order to perform the required drive authentication.

6. When the logical unit has not established a Bus Key for the authentication process, this command with Format Code = 8216 shall be terminated with CHECK CONDITION Status, 5/6F/02 COPY PROTECTION KEY EXCHANGE FAILURE – KEY NOT ESTABLISHED. 4 MEDIA KEY BLOCK (Format 8316) Table 4-17 – READ DISC STRUCTURE Data Format (With Format Field = 8316) Bit Byte 0 1 2 3 4 : 32,771 7 (msb) 6 5 4 3 DISC STRUCTURE Data Length 2 1 0 (lsb) Reserved Total Packs (msb) MEDIA KEY BLOCK Pack Data (lsb) This Command with this Format Code is used to transfer the Media Key Block (MKB) recorded in the Lead-in Area of a pre-recorded and recordable media that exist in format specific manner.

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AACS Introduction and Common Cryptographic Elements


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