Which is the right way to discourage large-scale piracy.

If I put my copy of an O'Reilly ebook online for anyone to grab, it's obvious the copy floating around is mine and I'm a jerk. But I can still give a copy of the PDF to a few friends and encourage them to buy a copy if they like it.

And, there's absolutely no way this is going to somehow bone me in the future. The authentication server isn't going to go down, it's not going to mistakenly think I lent out my "last copy" or lock me out of my purchase because I don't have internet access.