The Associated Press -- which thinks you owe it a license fee if you quote more than four words from one of its articles -- doesn't even care if the words actually came from its article. They'll charge you anyway, even if you're quoting from the public domain.The AP Will Sell You a "License" to Words It Doesn't Own (Thanks, James!)
I picked a random AP article and went to their "reuse options" site. Then, when they asked what I wanted to quote, I punched in Thomas Jefferson's famous argument against copyright. Their license fee: $12 for an educational 26-word quote. FROM THE PUBLIC FREAKING DOMAIN, and obviously, obviously not from the AP article. But the AP is too busy trying to squeeze the last few cents out of a dying business model to care about little things like free speech or the law.
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.