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Marco M Hurtado, George Gregory Gruse, Edgar Downs, Kenneth Louis Milsted: Multimedia player for an electronic content delivery system. International Business Machines Corporation, Steven J Meyers, David M Shofi, Fleit Kain Gibbons Gutman & Dongini P L, July 9, 2002: US06418421 (453 worldwide citation)

A system for tracking usage of digital content on user devices. Electronic stores coupled to a network sell licenses to play digital content data to users. Content players, which receive from the network the licensed content data, are used to play the licensed content data. Additionally, a logging s ...


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Gruse George Gregory, Hurtado Marco M, Milsted Kenneth Louis, Downs Edgar: Multimedia player for an electronic content delivery system. International Business Machines Corporation, May 1, 2003: TW530267 (31 worldwide citation)

A method of playing digital content data that has been compressed and encrypted with a first encrypting key on a system. According to the method, at least part of the content data is decrypted with a first decrypting key that corresponds to the first encrypting key. The decrypted content data is dec ...


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