Information security – Prevention of unauthorized use of data including prevention...
Reexamination Certificate
2005-05-19
2009-11-24
Barron, Jr., Gilberto (Department: 2432)
Information security
Prevention of unauthorized use of data including prevention...
C713S176000
Reexamination Certificate
active
07624451
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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Barron Jr. Gilberto
Kane Cordelia
Microsoft Corporation
Woodcock & Washburn LLP
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