
Strongbox is one of the most powerful tools for owners of paysites with secure membership content. Strongbox prevents password sharing, automated mass downloads and brute force hacking in it's roots. Unlike other similar tools it is not based on trap files, but on sophisticated programming with a multitude of visitor metrics such as sessions, IP's and customer location. Their html based login form with a human phrase verification gives brute force scripts like
Golden Eye and password guessers no chance.
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It's distributor
BetterCGI offers addons to automate secure password distribution and limit download limits with their second script
Throttlebox. Both scripts are available for a one-time fee. Installation and support may be purchased, separately.