Information viewing/listening system, information player,...

Details Information viewing/listening system, information player,... Information viewing/listening system, information player,...

2004-01-07

2008-11-25

Zand, Kambiz (Department: 2134)

Information security

Prevention of unauthorized use of data including prevention...

Access control

C380S001000

Reexamination Certificate

active

07458101

ABSTRACT:
To impose a restriction on actual use, such as playback, of content data and to reduce or prevent unauthorized use of content data by a unit that is not registered with an information provider, in response to an operation request to play content data recorded in a user unit, the user unit transmits current time information, the unit ID, content information, and operation information to a service center and, using these pieces of information, creates a one-time password that is valid only for a predetermined period of time. On the basis of the information transmitted from the user unit and current time information obtained from a time keeping unit of the service center, the service center similarly creates a one-time password and an operation permission command and transmits them to the user unit. The user unit compares the two one-time passwords. When the two one-time passwords match each other, the user-requested operation (playback) is executed.

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patent: 6813474 (2004-11-01), Robinson et al.
patent: 6885901 (2005-04-01), Tomii
patent: A 2001-067795 (2001-03-01), None

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