It IS their fault that they're selling DM books -- plenty of other
publishers (like the Pragmatic Programmers) seem to make a living without
assuming that all of their customers are thieves. I bought a book from them
assuming it would be a PDF & was furious when it was that adobe thing. It
may have said somewhere that that would be the case, but it certainly wasn't
anywhere obvious, like it should be with an issue like that. They lost my
custom for ever.