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