RythmEngine e = engine();
if (null == e) {
// not in Rendering process yet, let's assume it's safe to check system properties
return;
}
String s = e.conf().allowedSystemProperties();
if (s.indexOf(key) > -1) return;
checkRythm();
if (null != csm) csm.checkPropertyAccess(key);
if (null != osm) osm.checkPropertyAccess(key);
}