Encryption/decryption method and apparatus for controlling...

Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files

Reexamination Certificate

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Details

C705S050000, C705S051000, C705S052000, C705S057000, C705S058000, C726S026000, C726S027000, C726S028000, C726S029000, C726S030000, C380S200000, C380S201000, C380S202000, C380S203000

Reexamination Certificate

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08005758

ABSTRACT:
A method and apparatus for encrypting or decrypting digital content are provided. In the method, a binding range is selected from a plurality of binding ranges of content use based on license information of the content, and the content is encrypted based on the selected binding range so that the content can be used only within the selected binding range. Accordingly, it is possible to limit content use to a plurality of binding ranges of use of the content, using license information of the content.

REFERENCES:
patent: 2002/0002468 (2002-01-01), Spagna et al.
patent: 2005/0234826 (2005-10-01), Ohmori et al.
patent: 2006/0059573 (2006-03-01), Jung et al.
patent: 2006/0190621 (2006-08-01), Kamperman et al.
patent: 2007/0198417 (2007-08-01), Alve
patent: 11-85848 (1999-03-01), None
patent: 2000-020600 (2000-01-01), None
patent: 2000-0050143 (2000-08-01), None
patent: 2001-0050111 (2001-06-01), None
patent: 2002-0022283 (2002-03-01), None
Iannella, R., Digital Rights Management (DRM) Architectures, Jun. 2001, D-Lib Magazine, vol. 7 No. 6.

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