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Witnesses from Internet service providers Google Inc. and Yahoo Inc. said they have adopted corporate responsibility standards but are limited in their ability to oppose government policies.

Michael Samway, Yahoo’s deputy general counsel, said his company sometimes must filter information available on the Internet to comply with Chinese law, “which any Chinese company would be required to do.”

Some American Internet listings for Tiananmen Square in Beijing include photos of tanks and troops during a 1989 uprising and massacre. Chinese Internet listings for Tiananmen Square show only the kinds of photos that would appeal to tourists.

The Chinese government also censored Internet information about the 2003 severe acute respiratory syndrome (SARS) outbreak that had been traced to China.

Nicole Wong, Google’s deputy general counsel, said her company puts notices at the bottom of Internet pages in countries that promote censorship saying some material might be omitted to comply with local law.

“It isn”t perfect and we know that,” Ms. Wong said.

The company also does not offer G-mail or blogs in China because the government might trace the messages back to their source.

She suggested that the U.S. State Department take a bigger role in combating Internet censorship by foreign governments.