So, how much do e-book writers have to worry about piracy? It would seem that the barrier for entry, so to speak, for piracy of a PDF is a lot lower than for s

So, how much do e-book writers have to worry about piracy? It would seem that the barrier for entry, so to speak, for piracy of a PDF is a lot lower than for software, especially as it seems that someone's more likely to email their friend "this cool article" rather than "this software" with its attendant installation hassles.