This is a technology white paper written by an internet censorship company ("filter vendor") about internet censorship system in many countries. The company, "Watxhdog International" is based in New Zealand and behind the censorship system used by New Zealand, parts of the UK and controversial 'live pilot' of the controversial mandatory ISP-level filtering in Australia. The latter trial is using the "ACMA" blacklist, three editions of which were released by WikiLeaks in critical articles. WikiLeaks was itself then added to the blacklist and became the subject of a police raid in Germany and Federal Police investigation in Australia.
Link to the document: http://184.108.40.206/leak/netclean-whitebox-acma-watchdog-2009.pdf