Normally there are two types of restrictions for shareware.
The first one is the demo version with limited or crippled functionality that doesn’t have an expiry date and another type is the fully functional trial version that expires after a certain period of time.
This is how a lot of shareware knows you have no trial period left, even if you uninstall and re-install the program again. To start scanning, simply click on the All located at the bottom left.
The scanning will take a while since some of the methods require scanning the hard drive.
The right pane will show all the detected keys that are used by any shareware titles.