Information security – Prevention of unauthorized use of data including prevention... – Limitations on number or amount of copies
Reexamination Certificate
2007-08-14
2007-08-14
Moise, Emmanuel L. (Department: 2137)
Information security
Prevention of unauthorized use of data including prevention...
Limitations on number or amount of copies
C380S231000, C705S057000, C707S793000
Reexamination Certificate
active
09919518
ABSTRACT:
A key-sharing scheme is used to control distribution and use of video and audio content in personal digital assistants (PDAs) and other wireless devices. A private key is split into key-shares using a Blakley-Shamir key splitting technique and the key-shares are distributed to various network entities including a finance server and security server. Key-shares are also stored in a user's subscriber identity module (SIM) and a security processor of the PDA. The key-shares from the network entities are provided to the PDA after the user requests specific video or audio content and a credit verification is performed. The PDA's security processor combines the key-shares to form the decryption key for use in playing the content by the PDA's communications processor. When a service limit is reached, the PDA's security processor purges the key-shares to prevent further use of the content.
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Marvell International Ltd.
Moise Emmanuel L.
Pyzocha Michael
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