Prohibition is the act of forbidding something. In English, this is primarily handled by and "can't."
: Used for "external obligation"—the requirement comes from outside forces like laws, work, or school rules. wear a uniform at school". 4. No Obligation (Don't have to) Crucially, the negative of "have to" does mean prohibition; it means the action is optional. Don't have to Modal Verbs Of Obligation Prohibition And Permission Pdf