I used to use "Contact Owner" to accomplish that with a weird hack of alarms on the lockscreen, but this is much more elegant. Yeah, I signed up for both MobileDefense and WaveSecure when they came out. I currently use WaveSecure. Even knowing the secret doesn't help much, since you still need to get the correct pattern. And since it doesn't show your path as you try it, it's a lot harder to guess.