I invite you to try an experiment. If you have authored a textbook or monograph in the past 20 years, go to your favorite search engine and type in the title of that work. Scroll around a bit amongst the results and scrutinize the sources that claim to be able to provide your book, in full text, for a fee or for free. Did you find any that you were unaware of?…any that are giving it away for free that you did not know about or that your publisher tells you are illegitimate? How far down your list of search results did you have to go to find an instance of one of these illegitimate copies of your work?