I use Adobe Digital Editions to download library books and transfer them to my reader. I recently joined a second library system and after transferring books downloaded from that library am unable to read any of the books previously downloaded and installed from the first library. New books from second library work fine. Tried to download a new book from first library and it still does not transfer properly. Shows up okay, but upon opening get a protected page error. Any help in resolving this would be greatly appreciated.