I learned how to use New Hampshire’s online library system to download audio books and eBooks for FREE. I learned that audio books expire on your computer but not on your mp3 player, once downloaded. If they do expire, you may have to wait if the book is “checked out”, but you get an email when it’s back and then you have a very short time to grab it off of the virtual shelf.
eBooks look like they expire on the player itself. I’ll let you know!