It seems that Amazon is finally doing something to prevent people from self-publishing copyright-infringing material through Kindle.
Predictably, they are doing it in a ham fisted way. Specifically, demanding that self-publishers prove their publications are their own, within five day, by posting urls. Because that's how copyright works. (Not.)
On the positive side they are limiting these notices to authors of works that duplicate online material and so might reasonably fall under suspicion..But it seems like quite a few legit books are also getting caught in the net.
It seems that most users with book/online correspondences can provide this kind of proof--but I wonder what happens when you can't?