We have all used Kindle or other digital books in the past. Books that you buy from Amazon can’t be easily shared with everyone. Some of these e-book sellers have extreme restrictions in place to keep people from sharing books with others. You could always use a book scanner to digitize paper books and share them with others (not that we suggest you should). This Kindle Scanner, built with bits of a LEGO NXT system, can digitize your books.
The idea here is to take pictures of books and use a text recognition service to extract their text. Not the most practical solution around but not an uncommon approach either.[via]