Dunno but its the rules. Noticed that windows maintains a list of used networks and their encryption status so not conforming would be apparent (unless action taken to manually clear the history - and I wouldn't like to have to explain that if discovered !). Also had a recent scare with the dongles which got press coverage so security concerns remain high on the list.
Next time I get a day to myself I will set up the network and then go looking to see what telnet will disclose.