Why is uncopyrighted book marked "protected"
The book in your digital library, The Rahn Family of Wisconsin by Russell A Rahn and Marion J Rahn was given to your library by the authors so that others would be able to see it. Many years ago, they sent me a copy with a letter stating that "It is not copyrighted in any way, and you are free to make it available to anyone interested in the information."
I'm sure they would want it to be visible online. Is it possible that the protection label for this book is an error?