Boston start-up Boundless Learning Inc. says it will liberate college students from big textbook bills with free online versions built from public Web content. But the company is being sued for copyright infringement by three of the largest educational publishers in the world, who charge that it creates its texts by stealing from their well-known textbooks. “We deny the allegation, and we are going to defend our company’s mission strongly,’’ said Ariel Diaz, chief executive of Boundless Learning
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