This unfortunately sounds like something that can get people into a lot of trouble. It's a lot like the Carrier IQ debacle last year, where diagnostic software was left on some cell phones, and everyone went apeshit over it.

All it takes is for a single customer to leave the software on there and have it get distributed to their customers, and it might turn into a big privacy scandal all over again, with not only the customer but this company being dragged in front of Congress.

I would suggest adding code into your library that either forces a pop-up or gives a message saying that the app is currently using your software, so that it warns developers using your code that it's still activated, before they send it off the the App Store. The last thing you want is for this to get accidentally installed by unsuspecting end-users.