Patent ID: 7971070
Filing Date: 2011-06-28
Classification: G11B,H04N

Abstract:
1. A method for a recording device to record protected content from a readable storage medium to a recordable storage medium using a read-only media key block (MKB) stored in the recording device, wherein the recordable storage medium does not have an updated MKB when manufactured, said method comprising: (a) storing the read-only MKB in the recording device, wherein: the read-only MKB is self-authenticating by authenticating a digital signature of the MKB, such that the recording device knows if the MKB has been compromised, the read-only MKB comprises a matrix of device keys that allow a compliant recording device to calculate a media key and prevent a circumvention recording device from calculating a media key, and the recordable storage medium comprises a unique serial number, wherein the unique serial number comprises at least one unique identification number and an encryption of the at least one unique identification number, and is used by the recording device to prevent use of cloned serial numbers such that pieces of identical media can not be used to make unauthorized copies of the protected content by making a bit-for-bit copy; (b) if the recordable storage medium does not have a MKB, then writing the stored read-only MKB onto the recordable storage medium by having a disc format operation of the recording device write the stored read-only MKB at a pre-defined location on the recordable storage medium and logically in a file system of the recordable storage medium, and then writing the protected content from the readable storage medium to the recordable storage medium; (c) if the recordable storage medium has a MKB that is older than the stored read-only MKB, then writing the stored read-only MKB into the recordable storage medium by having a disc format operation of the recording device write the stored read-only MKB at a pre-defined location on the recordable storage medium where the older MKB was stored and logically in a file system of the recordable storage medium, and then re-encrypting and writing the protected content from the readable storage medium to the recordable storage medium, wherein all titles currently on the recordable storage medium are re-encrypted with a media key that is based on the read-only MKB; and (d) if the recordable storage medium has a MKB that is newer than the stored read-only MKB, then using the MKB from the recordable storage medium for writing the protected content from the readable storage medium to readable storage medium and replacing the MKB stored on the recording device with the newer MKB from the recordable storage medium that is temporarily stored in a non-volatile memory of the recording device.