专利内容由知识产权出版社提供
专利名称：Digital content distribution system and
protection method
发明人：Yuichi Yagawa,Koichi Sano申请号：US08887251申请日：19970702公开号：US06751598B1公开日：20040615
专利附图：
摘要：In a digital content distribution method and system, a storage medium iscomposed of a ROM area in which a key is stored and a RAM area in which a digitalcontent is stored. A storage medium certification unit of a terminal equipment judges
whether or not the key of the storage medium exists in the ROM area. Thereby, the useof an illegal copy of the digital content is prevented. If the key is valid, a digital contentexecution unit of the terminal equipment reads the digital content and executes it. Adigital content updating unit of the terminal system transmits to a distributor a requestfor transmission of the digital content together with a user profile code. The distributorrefers to a user management file to check the validity of the user profile code and thenumber of times of distribution. If they are valid, the latest edition of the digital contentis transmitted to the terminal system so that the digital content is updated by the digitalcontent updating unit. Thereby, the distribution and version-up of a digital content arefacilitated.
申请人：HITACHI, LTD.
代理机构：Mattingly, Stanger & Malur, P.C.
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