> How does one design an intruder detection system so that it can not be > used to spy upon one's employees or fellow workers ? We can already be spied on. We can be spied on by our sys admins, we can be spied on by intruders. Not much prevents almost anyone who wants to from spying on us. I don't know if these tools will increase the risk of being spied upon; perhaps, but probably only by people who may already do so anyway. I like to think that these tools will increase user privacy by assisting in the detection of such bad activity and by thereby helping to ward off those who, unwatched, might engage in spying. Teresa Lunt