The present invention relates to a data storage device capable of read and write processing of classified data with safety, and particularly to a data storage device, which stores a license for {HEAD ~ decrypting} and reproducing encrypted data obtained by a data distribution system enabling {TAIL ~ copyright protection}, allows multi access, and particularly can ensure copyright protection of copied information 
The present invention relates to a data storage device capable of read and write processing of classified data with safety , and particularly to a data storage device , which stores a license for { HEAD ~ decrypting } and reproducing encrypted data obtained by a data distribution system enabling { TAIL ~ copyright protection } , allows multi access , and particularly can ensure copyright protection of copied information
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