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So far the publishing group has not sought to take legal action against individual student downloaders, as the Recording Industry Association of America has done in its campaign to stamp out the illegal trading of music at colleges. The book-publishing group has not sought to shut down entire Web sites that offer downloads either, said Mr. McCoyd. Instead, officials are doing research on the extent of the problem and asking Web-site owners to remove individual files. "We've just tried to keep sweeping away these infringements as they continue to come online," he said.

One place their titles keep popping up is Scribd, a document-sharing Web site that opened this year. The site's policies do not allow users to post copyrighted content without permission, but some people break the rules.

"We have been fairly vigorous in monitoring these sites and in requesting that they take down our copyrighted content,"

Individual academic publishers have also taken steps to stop book pirates.

He said that if the problem worsens, publishers may have to take other steps to prevent piracy, such as releasing a new version of most textbooks every semester. The versions could include slight modifications that could be changed easily—such as altering the numbers in math problems. "They may compelled to," he said, "in order to stay one step ahead of the pirates."