<PackageReference Include="System.Security.Permissions" Version="11.0.0-preview.2.26159.112" />

System.Security.SecurityState

public abstract class SecurityState
Provides a base class for requesting the security status of an action from the AppDomainManager object.
namespace System.Security { public abstract class SecurityState { protected SecurityState(); public abstract void EnsureState(); public bool IsStateAvailable(); } }