See Serving Static Content using Plack

The search terms you're looking for are anti-hotlink and anti-leech

Its not something you want to do from CGI , its better to use mod_rewrite or mod_hotlink or something :)

Also of interest are Throttling your web server (Oct 00) and How can I use a CGI script to return an image?

In reply to Re: Serve a file from a CGI script by Anonymous Monk
in thread Serve a file from a CGI script by willymacoy

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