"Fic. Fan writers call it “playing in someone else’s sandbox” or “borrowing someone’s toys.” I call it “writing.” Opponents call it “stealing”—and I call that bullshit. Whatever else we call it, though, today we largely understand fanfiction as writing that continues, interrupts, reimagines, or just riffs on stories and characters other people have already written about. Fanfiction means writers getting their feet wet, their hands dirty—and if in their stories other body parts are sometimes getting wet and dirty, too, that doesn’t mean those same stories can’t be smart. If we call a piece of writing fanfiction, we usually (though not always) understand that it wasn’t published for profit."
This is literally the first paragraph in Anne Jamison's contribution to the introduction of this book.
I've a feeling this is going to be a contentious read indeed. Reading on.