Attorney here! (Not legal advice; consult a licensed attorney in your jurisdiction.) I am skeptical that this is a copyright issue that raised an attorney's a

Attorney here! (Not legal advice; consult a licensed attorney in your jurisdiction.) I am skeptical that this is a copyright issue that raised an attorney's attention. It's far more likely IMO that this was a contractual obligation imposed by the publisher. I have no insider knowledge as to whether this is actually true, but it's quite probable that in exchange for allowing Apple Books to republish their content, the publisher required Apple to append this attribution when copying content into the clipboard. In theory, preserving such an attribution might cause more copies to be sold. Also, contrary to your assertion, not every short snippet qualifies for a Fair Use defense; there's a four-factor test that courts apply, and the length is just one of those factors. But again, I think this less to do with copyright and more to do with a business arrangement.