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I can pull up twitter on my laptop while watching a video and tweet about what I'm watching, and if others are watching it at the same time, I can see their tweets about the same video. Why is putting that twitter content onto the same display as the video somehow different than when it was on my phone display, especially when injected between the player and the display? It would be different if Huang was taking video, modifying it with a twitter stream, and then distributing the resulting derivative work, but that's not what he's doing.

If I sold a transparent LCD display that displayed twitter content, and told buyers to put it in front of the video while it was playing. Would I still be making derivative content for profit? If not, why is compositing the video and overlay physically meaningfully different from the compositing happening between the player and the display?

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