The allegation that Mr. Dotcom’s previous venture, Megaupload, knew its users were illegally uploading copyrighted material — and indeed sought to encourage the practice — is a crucial part of the United States Justice Department’s indictment against the site and those who operated it.

In contrast, the new site appears to intentionally distance Mega from any legal responsibility for the content on its servers, although the terms and conditions of the site do explicitly forbid uploading copyrighted material.

“What he’s trying to do is give himself a second-string argument,” Charles Alexander, a lawyer in Sydney who specializes in intellectual property law, told The Associated Press. “‘Even if I was wrong before, this one’s all right because how can I control something if I don’t know that it’s there?”’ he imagined the new company thinking. “I can understand the argument; whether it would be successful or not is another matter.”

American prosecutors declined to comment on the new site, The Associated Press reported, referring only to a court document that cites promises Mr. Dotcom made while seeking bail, including one that he would not start a Megaupload-style business until the criminal case was resolved.

“Legally it’s probably the most scrutinized Internet start-up in history,” Mr. Dotcom said. “Every pixel on the site has been checked for all kinds of illegal — potential legal challenges. We have a great team of very talented lawyers that are experts in intellectual property and Internet law, and they have worked together with us to create Mega.”

The Motion Picture Association of America, which has filed complaints about what it described as copyright infringement by Megaupload, told The Associated Press that it was skeptical that Mr. Dotcom’s new site was harmless. “We are still reviewing how this new project will operate, but we do know that Kim Dotcom has built his career and his fortune on stealing creative works,” it said in a news release.

The Mega site offers 50 gigabytes of storage free; additional storage and bandwidth can be purchased at three tiers of monthly fees.