Well this has been finished for some time now, but I just haven't the time to post it ^_^.

http://www.64digits.com/download.php?name=GQunlocker.zip&id=23057

It unlocks, but cannot re-lock yet (if I recall correctly). Locking will be completed within a week or month or so…

Enjoy! Hope it works for you. To add a user to GradeQuick simply open the users.txt file and add one for yourself. You'll set the password with gradequick.

It's a Java JAR file by the way.