Most of us have probably sold an old book at a yard sale, on eBay, given it to a library, or some such thing. We probably never gave it a second thought. Maybe we need to. Maybe we are criminals, violating copyright law.
A case has come before the Supreme Court that could turn some of our assumptions upside down, at least as pertains to books produced overseas. Take that, Gutenberg! You better read Johannes' copyright notice before you sell your copy of his bible.