Transparency visibility must be preserved between overriding methods and the methods that are being overridden. If the virtual ...

Transparency visibility must be preserved between overriding methods and the methods that are being overridden.  If the virtual method being overridden or interface method being implemented is security safe-critical or security transparent, then the overriding method must also be either security safe-critical or security transparent.  Similarly, if the method being overridden is security critical, the overriding method must be security critical.