Patent ID: 7213155
Filing Date: 2007-05-01
Classification: G11B

Abstract:
1. A recording and reproducing method for a record medium, comprising the steps of: reading record medium encryption key version information from the record medium when data are recorded to the record medium and reproduced from the record medium on which the record medium encryption key version information has been recorded; reading apparatus encryption key version information from a recording and reproducing apparatus for the record medium; comparing the record medium encryption key version information read from the record medium with the apparatus encryption key version information read from the apparatus; prompting a user to obtain a later generation of encryption key version information when the record medium encryption key version information is a more recent version than the apparatus encryption key version information; and performing one of an encrypting and recording process and a decrypting and reproducing process for the record medium using an encryption key corresponding to the apparatus encryption key version information stored in the apparatus when the record medium encryption key version information read from the record medium matches the apparatus encryption key version information read from the apparatus; wherein the encryption key is recorded in address information recorded in the record medium; the record medium is a disc-shaped record medium and the address information is recorded in a lead-in area of the disc-shaped record medium; wherein the address information is recorded in the record medium such that grooves pre-formed on the disc-shaped record medium are wobbled, and the record medium encryption key version information is embedded at predetermined intervals in the address information.