In revising this book, we are greatly indebted to many of our professional colleagues who generously answered questions or provided background material. For this edition, our thanks go to Kathryn Glenn Speckart for the very useful unclaimed loan chart and to Diane Zorich for her insights into rights management. Special recognition is due Bonnie Morgan, who has served as the legal assistant for every edition of this book. She quickly proved to be irreplaceable.