Patent ID: 7372964

Claim:
An information recording method for recording information in a re-recordable area of an information storage medium, comprising: encrypting content and administration information of the content by using key information to generate encrypted information; modulating, based on a first modulation rule φ 1 , the encrypted information into first recording information; modulating, based on a second modulation rule φ 2 , the key information into second recording information, wherein the first modulation rule φ 1 and the second modulation rule φ 2 satisfy the following relationship: φ1 (φ −1 1(φ2( X )))≠φ2( X ), where X comprises information, φ 1 (X) comprises information which is obtained by modulating the information X by using the first modulation rule φ 1 , φ 2 (X) comprises information which is obtained by modulating the information X by using the second modulation rule φ 2 , φ −1 1 (X) comprises an inverse-modulation rule of the first modulation rule φ 1 (X), and φ −1 2 (X) comprises an inverse-modulation rule of the second modulation rule φ 2 (X); combining the first recording information and the second recording information such that the second recording information is embedded in a predetermined portion of the first recording information to obtain combined information and recording the combined information into the re-recordable area of the recording medium.