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The host verifies if the Dm received in step 5 matches the Hm calculated in step 6. If the verification fails, the host shall abort the current read operation. The following steps are not directly related to Reading Protected Area Data and may be skipped. 91 Page 38 Advanced Access Content System: Introduction and Common Cryptographic Elements 8. The host calculates the Protected Area Key (Kpa) as follows: Kpa = AES-G(Km, Binding_Nonce) 9. The host reads the encrypted Data associated with the Protected Area (ED) as a user data file whose LBA extent was specified in step 2.

The host encrypts the Data associated with Protected Area (D) using Kpa as specified in the Recordable Video book of this specification. 10. The host requests to write the encrypted Data associated with the Protected Area (ED) as a user data file whose LBA extent was specified in step 2. 91 Page 37 Advanced Access Content System: Introduction and Common Cryptographic Elements 11. Upon receiving the write request the drive writes the encrypted Data associated with the Protected Area (ED), the Binding Nonce, and the association between the two to the media.

The length of the Host Revocation List Record is always a multiple of four bytes. 3 Drive Revocation List Record Table 3-5 - Drive Revocation List Record Bit Byte 0 1 2 3 4 ... 7 8 ... 11 12 … 19 20 ... (12+ (N1-1)*8)-1 (12+ (N1-1)*8) … (12+ N1*8)-1 (12+ N1*8) 7 6 5 4 3 2 1 0 Record Type: 2016 Record Length Total Number of Entries Number of Entries in this Signature Block (N1) Drive Revocation List Entry (0) Drive Revocation List Entry (1) ... 91 Page 19 Advanced Access Content System: Introduction and Common Cryptographic Elements A properly formatted Media Key Block contains exactly one Drive Revocation List Record.

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