I need to run a surveillance system which'll be unattended for long periods of time. So I'm looking at a Digital Video Recorder (e.g. AppleTV) and one or more IP-enabled, motion-activated video cameras. Since others will have access to the AppleTV (including, possibly, the intruders!) I need to be able to password-protect and/or encrypt the stored video. What kind of compatibility issues are there? Can this be done with an AppleTV?