A device of the same general physical size and shape as a standard audio cassette tape, but which accepts digital information from any of a variety of sources—including for example: Internet transmission, a digital computer, or memory cards (especially digital memory cards)—and plays this digital...http://www.google.es/patents/US7436957?utm_source=gb-gplus-sharePatente US7436957 - Audio cassette emulator with cryptographic media distribution control
Audio cassette emulator with cryptographic media distribution control
