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If you are concerned about people leeching your images or files (and consuming your bandwidth), then this is the script for you. If another site tries to link to your graphics or text this script displays an error image.
Price: Freeware

What this script does is make it so "unauthorized" websites can't use images on your server. This will reduce the ammount of bandwidth being "leeched" from you. This can be a very valuable tool for webmasters who have a limited amount of bandwidth on their server.
Price: Freeware

Designed to stop the unauthorized linking of your website graphics and HTML pages from other websites, thereby using your bandwidth to deliver graphics and HTML pages to other website pages.
Price: $49.00

The Deleacher script prevents unauthorized linking to images on your server. Save money in bandwidth by blocking image leaching. Plus, the URL location of the image is completely concealed.
Price: $15.00

Protects your bandwidth, Stops people linking to your downloads, Supports a unlimited amount of folders and files, Hides real download location, Easy to setup.
Price: Freeware

FileProt is a simple to setup and use file protection script. What it does in a nutshell is not allow anyone coming from unauthorized places access to certain files on your webserver. This allows you to specify not only unauthorized domains but also pages in your own domain. You can tell it to only allow file or image downloads from certain pages in your domain. You can block hotlinkers and bandwidth leeches completely.
Price: Free for Members/$50

GuardMe Pro makes it impossible for any websites other that the ones you specify, to leech your images or files. Plug GuardMe Pro into the pages of your site and watch as your extra bandwidth charges disappear. Even if you don't have bandwidth limits on your site, Guard Me Pro is great for hiding disguising links and locations of files and images on your server. Stopping leechers will also make your site run much faster.
Price: $34.95

Horatio is a set of cgi-scripts and files that work hard to allow only legitimate visitors to access your valuable content. Contains all the old tricks, and some you won't have seen before. Stops password hurlers, stops image pirates, stops hot-linkers, stops bots, stops site rippers, stops leech programs, cloaks HTML code, disables copy, save and print.
Price: $79.00

Stop people linking to pictures stored on your web server.
Price: $75.00

Prevent others from linking to files on your site.
Price: Freeware