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I found out about it via LINX. It does appear to be very Cleanfeed like, but web censoring software is generally not that well known and are a key component of UK internet censorship. Other sources:

• Internet Watch Foundation
• Failures in a Hybrid Content Blocking System- Richard Clayton

"Their design is architecturally similar to that of CleanFeed, but they are employing Cisco’s proprietary Web Cache Communication Protocol version 2 (WCCPv2) to redirect suspect traffic to a number of patched squid proxy servers." Secretlondon 23:53, 4 August 2007 (UTC) reply