I've noticed riplocks at 2X with several original DVD-Videos too (I have a 1004 myself).
I asked TDB (tdb.rpc1.org) for a rip-unlocked version of the firmware and have been sent a test version of firmware V0250. Haven't tested it yet. I have to send him the results to verify it works ok.
If any of you want to volunteer too, I can send you a copy of it.