I finally figured out how to get rid of the annoying Copyright message that showed up after every singlel entry in the book. It turned out that I had long ago typed it in my Site Feed settings. I went back in there and took it out before generating the new book.
The those of you who use Blogspot, the field in question is under Settings on the dashboard, specifically under Site Feed. Now that I've made the books, I need to go back and reinsert a copyright notice.