>Besides, my solution does things yours doesn't. For example, does your solution pop up a small window on our receptionist's desktop whenever motion is detected so she can see who has entered our office? Same thing for the display monitor in our kitchen in case we're all at lunch.
Yep. With tunable triggers and alarms for any channel, including keycard system and various detectors.
>Does it email me when someone's in the office outside normal office hours? Does it securely archive after-hours video on a remote server so even if our office is trashed our video is still accessible?
It actually stores all the video on a locally secure (in a vault) RAID array for a month. Certain triggers can also start live streaming to a remote storage (it's not feasible to do it all the time).
>Those are all more important and more useful to me than your features.
Sure, these are typical features of mid-level security systems. Unfortunately, there are no such systems offered for Linux. Even though there are security DVR systems running embedded Linux.