Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2005-09-26
2011-12-20
Tran, Ellen (Department: 2433)
Cryptography
Video cryptography
Video electric signal modification
Reexamination Certificate
active
08081756
ABSTRACT:
A technique wherein a first electronic device, such as a server, provides to a second electronic device, such as a client device, a first portion of a digital-content stream. The first electronic device receives an identifier of a protection policy to be applied to the digital-content stream. The first electronic device provides to the second electronic device a data set that includes the policy and a key. In an embodiment, the data set is provided concurrently with providing the digital-content stream to the second electronic device. The first electronic device provides to the second electronic device a second portion of the digital-content stream that is encrypted using the key.
REFERENCES:
patent: 6055314 (2000-04-01), Spies et al.
patent: 7299209 (2007-11-01), Collier
patent: 2002/0136406 (2002-09-01), Fitzhardinge et al.
patent: 2003/0078795 (2003-04-01), Collier
Microsoft Corporation
Tran Ellen
LandOfFree
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