The library has to pay a fee to the publisher for each digital copy it buys from them. And depending on their deal, those digital copies might "expire." I can see where the publishers come from, but it does seem awfully artificial, huh?

The prologue kind of sucks--re-read it later, if you need to. It gets better once you get into the main story. Be warned, it takes FOREVER for plot points to advance. The details are what makes it great though.

Yep, I've read the whole series. I found it really hard to read on the computer though. I needed the real books.