Antileaching isn't a bad thing. It's applying a few lines of code to your .htaccess file and it stops people from "hot linking" your site goodies such as jpg, gif, png, css files.
Hot linking is when someone uses and image (for example) on their site but links to it from yours instead of hosting it on their servers. This means that if you get 10 visitors and they get 1,000,000 visitors they are using all YOUR server bandwidth up. Naughty!!!!
