“As a writer, how can I support this? I should be an absolutist on copyright protection for all books, magazines, and newspapers. But I’m not. The publishers have disgraced themselves, and they are paying the price. Three-hundred-dollar textbooks in the hard sciences are not unusual, and the companies are selling to a captive audience. Hundred-dollar add-ons, masquerading as digital workbooks, or problem-solving sets, are not uncommon.”