During his civil lawsuit against the People's Republic of China, Brian Milburn says he never once saw one of the country's lawyers. He read no court documents from China's attorneys because they filed none. The voluminous case record at the U.S. District courthouse in Santa Ana contains a single communication from China: a curt letter to the U.S. State Department, urging that the suit be dismissed.

That doesn't mean Milburn's adversary had no contact with him.

For three years, a group of hackers from China waged a relentless campaign of cyber harassment against Solid Oak Software Inc., Milburn's family-owned, eight-person firm in Santa Barbara, California. The attack began less than two weeks after Milburn publicly accused China of appropriating his company's parental filtering software, CYBERsitter, for a national Internet censoring project. And it ended shortly after he settled a $2.2 billion lawsuit against the Chinese government and a string of computer companies last April.