> Yeah, but I meant, HDMI is encrypted.

Not always.  DVI can be encrypted too.

> I'm not sure whether the laptop really supports generating an encrypted 
> video signal, and if so, from *what*...?

Does it have Vista?  If so then yes it probably does, for example if you 
connect a bluray drive (eg via USB if you don't have one in there already) 
and try to play a movie.  There is probably some API in Vista if you are 
writing a game and want it encrypted output for some reason.

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