The e-mail standard doesn't trouble me as much, but the phone call one certainly does. Just because one person (who isn't even the copyright owner) calls your company on the phone to complain about something on your servers generally shouldn't, in my mind, trigger "knowledge" liabiliity generally. Perhaps the caller specifically mentioned Ellsion, but the opinion isn't clear about that.Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.