Still, China appears satisfied that the document recognized “a leading role” for governments in cybersecurity matters relating to national security — one of China’s top objectives — and that it refers to the United Nations Charter, which enshrines principles of state sovereignty and nonintervention by the United Nations in domestic affairs.

“We think those principles apply to Internet communication technologies,” said one of the Chinese negotiators, who asked not to be identified because he was not authorized to speak publicly. “We found that the outcome document is in China’s interest.”

The document was formally adopted as China holds its World Internet Conference, which started Wednesday. The conference is part of a global lobbying effort by China aimed at promoting a concept, “Internet sovereignty,” which maintains that each nation should have the unfettered right to regulate cyberinfrastructure and activities in its territory, including the ability to censor and restrict information within and across its borders.

The three-day meeting, held in the eastern province of Zhejiang, was used last year by officials to urge participants to sign a pledge accepting China’s claims to Internet sovereignty. Concerns that a new document could be circulated have led to less Western corporate and diplomatic participation this year, according to several people familiar with the attendees, who asked not to be named to avoid retaliation by Chinese authorities.

China has long tried to gain a broader say in how the Internet and technology more generally are regulated worldwide. Beijing has prevailed on state-run telecom operators to spend heavily to gain more influence in cellular standards, while Chinese officials have worked their way up the hierarchies in global regulatory bodies, like the International Telecommunication Union, whose secretary general is Chinese. The agency has increasingly taken on cybersecurity management, a prime Chinese objective, as a result of the first World Summit on the Information Society outcome document, adopted in 2005.

The Chinese president, Xi Jinping, endorsed Internet sovereignty in his keynote address at the Chinese Internet conference on Wednesday. Lu Wei, China’s Internet czar, whose handle on the popular social messaging app WeChat translates to “I’m Watching You,” has raised his international profile with trips abroad to lobby for acceptance of China’s view of how the Internet should be managed. That includes a major Chinese-American technology forum held in Seattle in September with top executives from Silicon Valley companies like Apple and Facebook.