Washington-based NeuStar, which plans to set up the kid-friendly Internet zone, said it would rely on existing guidelines for television and advertising to determine what material would be appropriate for the dot-kids.us domain.

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Developers would have to follow FCC rules for radio and television, which bar profanity and require some educational content, the privately held company said, while advertisements would have to comply with guidelines set up by a Better Business Bureau panel.

Illegal drug use, alcohol or tobacco use, gambling and skimpy clothing also would be prohibited, the company said. Exceptions could be made if the material had educational, literary or scientific merit, the company said.

While explicit violence and weapons use would be prohibited, determining exactly where to draw the line could be problematic, NeuStar said.

"We invite commenters to suggest means of defining a bright-line test for determining when violent content, or any other inappropriate content, might be inappropriate for a 12-year-old," the company said in comments published on its website.

The company, which also manages the new dot-biz domain, said it was seeking public input until Oct. 11.

Congress has for years tried to prevent children from being exposed to pornography, hate speech and other "adult" content on the Internet.

After several attempts to ban content outright were struck down by the courts, lawmakers have proposed setting up a kids-only area within the United States' dot-us domain.

The House passed the bill in May, and a similar version has been introduced in the Senate.