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3.5 Censorware on the client (child protection e.t.c)

Normally the censorship is implemented on servers from the ISP or government, but in some schools, private homes and some companies the blocking software is installed on every PC.

More info: http://www.peacefire.org/
http://www.encyclopedia-online.info/Censorware
http://www.cexx.org/censware.htm
http://www.epinions.com/cmsw-Kids-Topics-2
http://www.securiteam.com/securityreviews/Web_blocking_software_can_be_easily_bypassed.html