Problem moving library book to Sony Reader PRS-650

I am getting an error message "CE_Copy_Not_Allowed - No permission to copy this book" when I try to move a library e-book to my Sony Reader PRS-650. The PRS-650 shows up on ADE even when I open ADE as administrator. I finally managed to get to show in a list on the Sony Reader Program file, but it still isn't on the Reader.