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This property can be overridden in a derived class. The base implementation always returns null.
This property is called at AppDomain creation time. It allows a host to supply a policy for the current AppDomain. A policy level consists of the following:
A set of code groups organized into a single rooted tree.
A set of named permission sets that are referenced by the code groups to specify permissions to be granted to code belonging to the code group.
A list of fully trusted assemblies.
See the Notes to Inheritors for the System.Security.HostSecurityManager class for critical implementation information.