Deny access permissions - apache, linux

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http://stackoverflow.com – How can I deny access permission to an entire folder except one file? For example, my DocumentRoot is "/var/www/html" and there I have a folder called example. In there, there are many files and one of them is index.php. So I want to give access permission only to this file, and deny access permissions to the other files in that folder. (HowTos)