That's true, especially if users keep their shared passwords in a password safe. And if the copy-pasting raises some red flags, the account owner could also re

That's true, especially if users keep their shared passwords in a password safe. And if the copy-pasting raises some red flags, the account owner could also record keystrokes and replay them, with a bit of randomness added to the timing, with software or a hardware attachment (http://www.practicalarduino.com/projects/virtual-usb-keyboard http://www.practicalarduino.com/projects/virtual-usb-keyboar...). This is the sort of countermeasure that attempts to cut down on casual account sharing, not a determined cheapskate. I thought from the headline that this software was recording all keystroke timing, not just the password, and would detect intruders, not account sharers. That might be another application, or privacy invasion, depending on one's perspective.