Armstrong, Westerman, Hattori, McLeland, & Naughton
Apparatus for data copyright management system
 A data copyright management apparatus for handling data copyrights and data of digital cash, and for use in video conference systems is provided. The data copyright management apparatus is connected to a user terminal, and is used for performing decryption of encrypted digital data to be copied and edited, and also performing encryption of decrypted digital data to be stored, copied and transferred. The data copyright management apparatus may comprise one central processing unit so that either one of a microprosser of the user terminal and the microprocessor of the data copyright management apparatus performs decryption of the encrypted data and the other performs re-encryption of decrypted data at the same time. The data copyright management apparatus may also comprise two central processing units so that one central processing unit performs decryption of the encrypted data and the other central processing unit performs re-encryption of the decrypted data at the same time. The data copyright management apparatus may be configured in the form of a monolithic or hybrid IC, an IC card, a PC card, or an insertion board. Further, the data copyright management apparatus may be incorporated in a computer, a television set, a set-top box, a digital video tape recorder, a digital video disk recorder, a digital audio tape apparatus, or a personal digital assistants and the like. 
Mitsubishi Corporation
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Makoto Shunichi
Saito Momiki