B&N app read both ePub and eReader pdbs, with or without the DRM.
I'm not sure how one would go about adding them to the Library (sorry, didn't think to see if they'd be automatically picked up from the B&N Userdata folder), but my DRMed PDBs popped up the Name/CC dialogue when I drag and dropped them straight onto the B&N app window.
The books unlocked just fine and I could flip back and forth through the pages without any problems. I tried a book from each combination of formats (ePub/PDB|DRM/free) in both readers, though the regular eReader app could only read eReader format (didn't respond to drag & drop, either, had to manually select books from the menu).
Hope this helps.
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