Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-07-04
2006-07-04
Moise, Emmanuel L. (Department: 2134)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C380S278000
Reexamination Certificate
active
07073063
ABSTRACT:
To render digital content encrypted according to a content key (KD) on a first device having a public key (PU1) and a corresponding private key (PR1), a digital license corresponding to the content is obtained, where the digital license includes the content key (KD) therein in an encrypted form. The encrypted content key (KD) from the digital license is decrypted to produce the content key (KD), and the public key (PU1) of the first device is obtained therefrom. The content key (KD) is then encrypted according to the public key (PU1) of the first device (PU1(KD)), and a sub-license corresponding to and based on the obtained license is composed, where the sub-license includes (PU1(KD)). The composed sub-license is then transferred to the first device.
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Ho Thomas
Microsoft Corporation
Moise Emmanuel L.
Woodcock & Washburn LLP
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