This interface is implemented by components to enable privileged code to
check whether the component has a given permission.
This is typically used when a privileged component (e.g. the container) is
performing an action on behalf of an untrusted component (e.g. a web
application) without the current thread having passed through a code source
provided by the untrusted component. Because the current thread has not
passed through a code source provided by the untrusted component the
SecurityManager assumes the code is trusted so the standard checking
mechanisms can't be used.