Wondershare uses online verification. Once a leaked code is used by multiple people, the server blacklists it, and the software will revert to the trial version.
A registration code (or license key) is a unique string of characters provided by Wondershare upon purchase. When paired with your registered email address, it validates your software and removes trial limitations, such as:
Using modified software can compromise the data on your phone, which is the opposite of what a recovery tool should do. How to Get a Valid Dr.Fone License
If you are having a specific issue with your phone, let me know: