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WikiLeaks touched off an international uproar in April 2010 when it released a classified helicopter video showing a U.S. attack that killed two Reuters journalists in Iraq. It later began publishing tens of thousands of U.S. military documents on the wars in Afghanistan and Iraq, and classified U.S. diplomatic cables whose revelations angered and embarrassed the United States and its allies.

Mr. Assange told a London audience in September that the German had been suspended, although he declined to go into details. He denied there had been a dispute over his management. “It was about a different issue,” Mr. Assange said. He refused to elaborate.

Several reporters from the Guardian, the New York Times and Der Spiegel who were involved in their news outlets’ publication of leaked WikiLeaks documents also have written books on their dealings with the group and Mr. Assange that will be published soon or are already available.

Mr. Assange, who currently is fighting extradition in London over rape allegations in Sweden, also is planning to publish his own version of events in April.

Mr. Domscheit-Berg has not publicly commented on the rape allegations against Mr. Assange, but in the book he describes the Australian’s attraction to women as “very simple: 22. They should be young. And it was important to him that they did not challenge him.”

In launching OpenLeaks, Mr. Domscheit-Berg said he planned to give whistleblowers more control over the secrets they spill. He has criticized WikiLeaks for both receiving documents and aggressively vetting how they are presented to the public.

“At OpenLeaks, we want to learn from the mistakes that we made during the last three years at WikiLeaks,” he said.