I see this to be no different than having Greg's webcam taking a shot of the dealers floor every 10 seconds. I don't think Greg makes everyone fill out a permission slip every year.
Yes, I'm sure there are some dealers who don't want their items to be displayed to the public, but I don't see this causing an uproar at other functions.
I'm not a lawyer so I can't speak on the "legal" issues of recording our convention.
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