Securely relaying content using key chains

Details Securely relaying content using key chains Securely relaying content using key chains

2008-03-25

2008-03-25

Elisca, Pierre Eddy (Department: 3621)

Data processing: financial, business practice, management, or co

Business processing using cryptography

Usage protection of distributed data files

C705S050000

Reexamination Certificate

active

11388241

ABSTRACT:
A system, apparatus, and method are directed towards generating chains of encrypted decryption keys for content in a highly distributed environment. In one embodiment, the key chain may be provided within an Entitlement Control Message (ECM). An access key that enables decryption of a current link within the chain of decryption keys may be provided to a downstream recipient using an out-of-band mechanism. Alternatively, the access key may be provided through an in-band mechanism, such as through the use of Entitlement Management Message (EMM), or the like. In one embodiment, the access key within the EMM may be further encrypted by another encryption key that may be unique to the downstream recipient.

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