This is done because the last part of many people's IP address changes every time they get on the internet. It then exits. The script counts the number of IP addresses that shavenferret has used. It e-mails you the username, and can be set to automatically delete the account. It then tells the user what is happening, and exits.
Some sites record the user information in a text file as well as the .htpasswd file.
If your site does that, and you want the script to remove the user from the text file as well as the .htpasswd file, I can modify the script for free. If you want this, e-mail me after you have purchased the script. Upgrades will be mailed to you free.