>> LOL, I suspect they can do it slightly more subtly than that!  They only
>> need to make some tiny changes to some of the pixels to be detectable. 
>> In theory they could do what you suggest though, would be fun :-)
> 
> Probably a form of steganography, at a guess.

Well, if they're hiding player ID information in the video, then that 
would, by definition, be "steganography". That's what steganography 
*is*, after all...

The question is which steganographic technique they'll use. ;-)

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