"Even more difficult are Web filters that try to screen for 'bad
attitudes': hate, intolerance, racism- lotsa luck. No regular
expression can differentiate between a news report of a hate crime,
and a site that promotes such.
"Commercial Web filtering software is expensive and secretive.
With the exception of Net Nanny, blocked URLs and keywords are
hidden underneath a layer of encryption- the user is not allowed to
review them. You may never know what you're missing. Server-level
licensing is generally per-seat, and requires a separate proxy
server, adding to the cost. squidGuard is free, completely open
right down to the source code, and runs on the free proxy server
Squid, on Linux or *BSD, also free.
"squidGuard has no hidden agenda. The default blacklists,
printed in plain text, contain a disclaimer printed right at the