The government has invited Internet providers to participate in a live test expected to be completed by the end of June.
The country's largest Internet provider, Telstra BigPond, has declined, but others will take part. Provider iiNet signed on to prove the filter won't work. Managing director Michael Malone said he would collect data to show the government "how stupid it is."
The government has allocated 45 million Australian dollars ($30.7 million) for the filter, the largest part of a four-year, AU$128.5 million ($89 million) cybersafety plan, which also includes funding for investigating online child abuse, education and research.
One of the world's largest child-advocacy groups questions such an allocation of money.
"The filter may not be able to in fact protect children from the core elements of the Internet that they are actually experiencing danger in," said Holly Doel-Mackaway, an adviser with Save the Children. "The filter should be one small part of an overall comprehensive program to educate children and families about using the Internet."
Australia's proposal is less severe than controls in Egypt and Iran, where bloggers have been imprisoned; in North Korea, where there is virtually no Internet access; or in China, which has a pervasive filtering system.
Internet providers in the West have blocked content at times. In early December, several British providers blocked a Wikipedia entry about heavy metal band Scorpion. The entry included its 1976 "Virgin Killer" album cover, which has an image of a naked underage girl. The Internet Watch Foundation warned providers the image might be illegal.
Canada, Sweden, the United Kingdom have filters, but they are voluntary.
In the United States, Pennsylvania briefly imposed requirements for service providers to block child-pornography sites, but a federal court struck down the law because the filters also blocked legitimate sites.
In Australia, a political party named the Australian Sex Party was launched last month in large part to fight the filter, which it believes could block legal pornography, sex education, abortion information and off-color language.
But ethics professor Clive Hamilton, in a column on the popular Australian Web site Crikey.com, scoffed at what he called "Net libertarians," who believe freedom of speech is more important than limiting what children can access online.
"The Internet has dramatically changed what children can see," said the professor at Charles Sturt University in Canberra, noting that "a few extra clicks of a mouse" could open sites with photos or videos of extreme or violent sex. "Opponents of ISP filters simply refuse to acknowledge or trivialize the extent of the social problem."









Agree:
Disagree: 






