Data transfer system, data transfer apparatus, data...

Details Data transfer system, data transfer apparatus, data... Data transfer system, data transfer apparatus, data...

2007-03-13

2007-03-13

Revak, Christopher (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C726S030000, C705S050000

Reexamination Certificate

active

10167923

ABSTRACT:
Disclosed is a method for causing either encrypted first content data or unencrypted second content data, to be selectively recorded to a storage medium in a data recording apparatus. When the data recording apparatus is to return the encrypted first content data to the data transfer apparatus, the return is inhibited if the data are judged to have been edited. Upon return of the encrypted first content data, a content ID held by the data recording apparatus regarding the first content data is matched against a content ID held by the data transfer apparatus regarding the received data. Where the encrypted first content data are known to have been edited, the content ID matching process is omitted.

REFERENCES:
patent: 5835601 (1998-11-01), Shimbo et al.
patent: 6539468 (2003-03-01), Inoue et al.
patent: 6748539 (2004-06-01), Lotspiech
patent: 6832319 (2004-12-01), Bell et al.
patent: 6865552 (2005-03-01), Inoue et al.
patent: 6987854 (2006-01-01), Maillard

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