I'm not sure if this is how B&N is doing it, but it dislike buying a book and have it only available on the companies servers. Sony for example, if I purchase a book from their estore, the digital data remains on my computer and I can upload it back to the reader as often as I like.
I just worry that if a company goes out of business, there goes all the stuff I bought from that company if their servers go down to. Having an reader that supports a wide variety of formats doesn't hurt either, since it'll allow me to shop else where.
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