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The JavaScript security model for signed scripts is based upon the Java security model for signed objects. The scripts you can sign are inline scripts (those that occur within the SCRIPT tag), event handlers, JavaScript entities, and separate JavaScript files.
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A signed script requests expanded privileges, gaining access to restricted information. It requests these privileges by using LiveConnect and the Java classes referred to as the Java Capabilities API. These classes add facilities to and refine the control provided by the standard Java SecurityManager class.
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Access control decisions are given based on who, called principal, is allowed to do what, called target, and the privileges associated with the principal.
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