I don't have this particular app, but I have Longman's Dictionary of Contemporary English (5th ed.), also by Enfour, Inc. that I bought last year for, I don't remember, $50 I think (at the time, now they've dropped the price).

The latest version displays "I'm a software thief" as a notification, says to run the app in safe mode and then crashes.

https://itunes.apple.com/us/app/longman-dictionary-contempor...

Oh, and I'm not jailbroken.