Anti-leech is a protective IIS software tool which prevents unauthorized access of resources on your server via direct linking. Ideal for image collections, software archives, document archives, video and Flash games.

Thankfully, there is a solution to this problem in the form of IIS Anti-leech Sniffer Dog. This IIS plug-in will safeguard your website from bandwidth bandits who attempt to steal your traffic by linking directly to the resources on your server.
If you have a collection of images, videos, documents, software, or even flash games, UISD is the perfect product for you. Once installed, your site will continue to function normally, and all search engines and inbound links will remain valid. User favorites will still work as well.
However, if someone attempts to embed your content directly onto their site, they will only see a logo or an error message. By using UISD, you can save a lot of traffic and, in turn, save money. You can even redirect hotlink requests to your homepage and potentially gain new visitors.
IIS Anti-leech Sniffer Dog is coded in C++ and is highly effective, particularly with multi-thread IIS5 and IIS6. It uses minimal CPU resources and performs better than products that use C# ASP scripting. UISD is engineered for high load capability and is extremely reliable. If you want to protect your website from leechers, this product is an excellent choice.
Version 5.03: http://Anti-leech.versalsoft.com