I don't understand the quixotic obsession with fighting e-book copying.

As with music and movies, it only takes one person to succeed in ripping a non-DRM'ed copy of an ebook before it'll be easy to widely distribute via BitTorrent and similar software.

Amazon has already discontinued the direct download of (weakly-encrypted) Kindle book files to PCs, and so once Kindle for PC is gone, the cat-and-mouse games will likely move to the e-reader firmware itself.