Since your main interest is library books, I recommend that you start with the Sony Reader Library software. The Sony software will also give you access to free books offered by Sony as well as anything else in their bookstore. If you don't like it, then you can switch to Adobe Digital Editions to transfer your library books. They are both free programs so you can always try both and see which you prefer. I use the Sony software for managing my library because I like its ability to sync my collections and books between my computer & ereader. It works just fine for me. However, many people like to use ADE too.
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