That's a moot point. You can also use some kind of multichannel ADAT recorder or similar to capture the frame stream of any laser DAC.
Also, if you are able to somehow insert a IDN frame grabber into the network stream, then you probably already have access to the show anyway, in some form or another.
Not that I disagree with you, but I also don't think progress should be limited because of such concerns. If large companies don't want to implement open formats because of piracy, then fine.
It only matters for preprogrammed shows anyway. Interactive shows will hopefully become more of a standard.