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/Peo, FreeWebSpace.net
I used to have this PHP script which would.. check the referring domain (multiple) and if authorized would go on and parse the rest of the page, if not it would just stop there and won't go any further.
Change the RewriteRule .*\.(php)$ - [F] to the extension of the pages/files you want to restrict, for multiple files you can use .*\.(php|html|zip|jpg)$ etc ...
Domains not listed there as allowed will be directed to your 403 page