Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2005-12-06
2005-12-06
Nguyen, Cuong (Department: 3661)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S054000, C705S067000, C705S057000, C705S059000, C705S080000, C705S026640, C705S071000, C380S255000, C380S258000, C713S176000
Reexamination Certificate
active
06973444
ABSTRACT:
A method is disclosed for a device to interdependently validate a digital content package having a piece of digital content in an encrypted form, and a corresponding digital license for rendering the digital content. A first key is derived from a source available to the device, and a first digital signature is obtained from the digital content package. The first key is applied to the first digital signature to validate the first digital signature and the digital content package. A second key is derived based on the first digital signature, and a second digital signature is obtained from the license. The second key is applied to the second digital signature to validate the second digital signature and the license.
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Blinn Arnold N.
Jones Thomas C.
Nguyen Cuong
Woodcock & Washburn LLP
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