@Override
    protected boolean checkAuthentication() {
        return !super.checkAuthentication();
    }
Tag that renders the tag body only if the current user has <em>not</em> executed a successful authentication
attempt <em>during their current session</em>.

<p>The logically opposite tag of this one is the {@link AuthenticatedTag}.
support/jakarta-ee/src/main/java/org/apache/shiro/ee/faces/tags/NotAuthenticatedTag.java