Patent ID: 7953098

Claim:
A storage device able to communicate with an external device, said storage device comprising: a memory area for storing identifiers in an identifier list for allowing utilization of contents of said external device; means for receiving an identifier belonging to a certain external device from said external device said external device comprising: a user accessible area for recording an encryption content acquired from said storage device; and a tamper resistant area for recording a license acquired from said storage device, said tamper resistant area comprising a structure sealed by resin such that a circuit is broken if the resin is removed therefrom; means for judging whether said received identifier is included in said identifier list or not; means for starting an operation for allowing utilization of contents to said external device when said identifier is included in said identifier list; means for determining whether a registering space is available in said memory area of said identifier list; in an event that said registering space is available in said memory area, said storage device registers said identifier to said memory area of said identifier list when no identifier is included in said identifier list; in an event that said registering space is not available in said memory area, said storage device stops said operation; and wherein said storage device is a magnetic disk drive, said magnetic disk drive comprising: a magnetic head; a magnetic disk; and a read-write channel.