something that is protected against something else is safe from that something else
safe_house is not tangible_thing. protecting_oneself_from_predators is protectingoneself. safe_house is tangible_thing. protecting_oneself_from_predators is not protectingoneself. protecting is not helping. password_protective_thing is authentication_protected_thing. dangerous_thing is tangible_thing. authentication_protected_thing is restricted_thing. password_protective_thing is not authentication_protected_thing. authentication_protected_thing is not restricted_thing.