Patent ID: RE39802

Claim:
A storage medium accessed by a vendor computer and user computer, said storage medium for storing information readable by said user computer, said storage medium comprising: encrypted electronic data to be decrypted by the user computer ; and a medium personal number which is unique for each storage medium particularly personal for each storage medium and is different from a medium personal number of another storage medium , wherein at least the medium personal number is written onto the storage medium in an un-writable form which said user computer cannot rewrite, and said medium personal number is used for generating a decryption key for decrypting said encrypted electronic data in said user computer ; and permission information which includes the decryption key encrypted in a manner that is generated independent from a specific apparatus number for a specific computer, and generated based upon said medium personal number, said permission information and said medium personal number enabling the user computer to decrypt the encrypted decryption key and to decrypt the encrypted electronic data in a manner that the user computer does not use the specific apparatus number for the specific computer in decrypting the encrypted decryption key and the encrypted electronic data .