The good people over at Techfocus have created a fileset that allows webmasters to prohibit users whose IP’s are known to be regulated by the RIAA or MPAA from exploring their sites. The file is new and incomplete, but should be able to filter out most RIAA traffic. Hundreds of members and programmers have joined the struggle to tweak this file further.

The latest version of the file should always be available at this address:
http://techfocus.org/files/htaccess.zip

More information about the struggle for user’s right can be found at:
  Boycott-RIAA
  Techfocus