The DRM ones are eReader format. You won't be able to read them on your Libre, unless you remove the DRM first so that Calibre can convert them.
Some of their books come without DRM, so you can punch those right into Calibre for conversion, but there's no way to know for sure before a purchase whether or not it has DRM. (One way to maybe tell is to check the same book at Fictionwise. It seems the DRM-free books at Fictionwise are the same ones B&N has DRM-free, but you can't be certain of that pre-purchase.)
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