Patent ID: 8005501

Claim:
A method, comprising: using a memory reading device for electronically reading data from a tangible, non-transitory memory device, where said data that is read from the memory device includes both content, and also includes a memory specific value from the memory; first using a processing device which is programmed to carry out a technique to automatically determine if the content on the memory is authorized, by determining a verification value in said content that is read from said memory as part of said content, and checking said verification value to determine if said verification value represents a valid result of numerical operation using said memory specific value to form said verification value, wherein said checking is carried out at least once each time the memory is used and preventing said memory reading device from playing the content of the memory if the first using does not indicate that the verification value represents a valid result of the numerical operation, wherein said memory is an optical disc, and said memory reading device detects information on the optical disc that indicates a manufacturing of the optical disc, wherein said checking further includes an encryption technique as part of said numerical operation, said encryption technique which comprises storing an encrypted value in the memory, said encrypted value having a value that is dependent on content of the memory, decrypting the encrypted value and determining if the decrypted value matches in a specified way to the content in the memory.