From Satyam Technologies:
Protected Download Links created can be set to expire after a certain amount of time calculated from link creation or first download. Protected Download Links can be set to expire after certain number of clicks. Access to the download links can be IP Locked allowing certain IP Addresses the access or disallowing certain IP Addresses. Download Links created by Protected Links Software can be for a single user or multiple users. Hide the actual location and name of the downloadable file. Send links to your downloadable products by Email as a protected link with limits on download period and access. It works with any autoresponder/newsletter system editor that allows to insert a hyperlink. A Link Profile and complete statistics available for the download links allowing you to modify access for each link created. The Protected Download Links Admin Area allows you to view the complete download link profile. Valid and Invalid Download Attempts. It allows you to ban invalid download accesses effectively.