Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2005-06-28
2005-06-28
Hayes, John W. (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C380S200000, C380S223000, C380S241000, C380S044000, C725S025000, C725S030000
Reexamination Certificate
active
06912513
ABSTRACT:
The present invention is a method and apparatus for providing copy protection for a content. A descrambler descrambles the content delivered by a content provider using a local key. A key generator is coupled to the descrambler to generate the local key from a programmable user key according to an authorization code provided by the content provider.
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Blakely , Sokoloff, Taylor & Zafman LLP
Hayes John W.
Sony Corporation
Sony Electronics Inc.
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