Comment by shmerl

So they did disclose them? No doubt under pressure from B&N. If you look at those patents, you'll see that they are bizarrely trivial. Such things should never be patentable in the first place. Surely invalidating them can be not so easy, but it can be possible. It's one of the reasons why MS attempts to push NDAs as much as possible (we are lucky this was disclosed in those cases). Probably only a minority of their patents are non trivial, and most of these racket attacks are based on these kind of junk patents.