To the OP, obviously someone was trying to hack into your account ONLINE, just because you hadn't touched your nook in a long time, doesn't mean your account was untouched.
On another note, I also strip the DRM from all the books I buy from B&N.
But I suppose if someone tried to hack into my account, B&N could still limit my access? If that ever happens, I'll just throw it out the window, roll over it with my car, call my mommy and tell her it's not fair, and then throw myself on the floor and have a little fit.
(did I take that a little too far? LOL)