>> Interesting. So the film actually ends a different way depending on 
>> which player you play it with?
>>
>> I bet that'll be popular...
> 
> 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 :-)

Well, the article states that it's supposed to resist somebody pointing 
a video camera at their TV screen, so a 1-pixel alteration won't do.

What I suppose they might do is have maybe a 1-frame difference in how 
long a given scene is. Like, on some disks the shot of the ocean is 1362 
frames long, and on others it lasts for 1366 frames. The difference 
should be reliably detectable no matter how you film it.

Still, it seems like a hell of a lot of work considering that it doesn't 
actually stop illegal copying, it just makes it hypothetically possible 
to find out who did the illegal copying...

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