Hierarchical trusted code for content protection in computers

Details Hierarchical trusted code for content protection in computers Hierarchical trusted code for content protection in computers

2004-12-20

2009-02-24

Revak, Christopher A (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S175000, C713S176000, C705S051000, C711S154000

Reexamination Certificate

active

07496769

ABSTRACT:
An architecture for protecting premium content in a nonsecure computer environment executes only a small number of code modules in a secure memory. The modules are arranged in a hierarchy of trust, where a module names other modules that it is willing to trust, and those modules in turn name other modules that they are willing to trust. A secure loader loads a security manager that oversees a number of content-providing modules for manipulating the content. A memory manager assigns permissions to various pages of the secure memory. The memory has rings of different security. The security model can be extended to program modules and other devices on the computer's bus, such as DMA controllers and peripherals.

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