It's not the real world, Tolkien doesn't have to be published, just his journals stashed somewhere in a British lord's library, where Daniel Jackson had a chance to stumble upon them. And of course Rodney considers recreational materials scanned and uploaded anywhere fair game.

Except in my brain, it's Vala who'd read them. "Elladan and Elrohir? Weren't they in the so and so's library? Daniel, you told me those stories weren't real."