I was under the impression they knew, but didn't care. In the past I had uploaded GB-sized HDTV stuff and had it instantly uploaded and available to a friend. I

I was under the impression they knew, but didn't care. In the past I had uploaded GB-sized HDTV stuff and had it instantly uploaded and available to a friend. I figured they just hashed it, realized someone else already put it up, and added that file to my account or otherwise linked it into my account.