Professors get ‘F’ in copyright protection knowledge:

Professors are making material available free rather than requiring students to buy $100 textbooks. While faculty members from Harvard University to the University of Pennsylvania complain of a restricted flow of ideas, publishers say they must protect $3.35 billion in annual U.S. college textbook sales. “We can’t compete with free,” says Allan Adler, vice president for legal and governmental affairs with the Washington-based publishers group, whose members include McGraw-Hill Cos. and Pearson Plc.