What is the security like in these meetings? Is any security agency taking part on these ceremonies? What is preventing a terrorist group to launch an attack against this people considering the importance of all of them? I am probably exaggerating because all this reminds me of the not-so-old movies about hacking a la "Mission: Impossible" film series. Do they say that the meeting is going to take place in one place — like in the article it says El Segundo, CA — but actually meet elsewhere? Do the key holders have security 24/7 in their respective countries to prevent stolen keys?

Again, I am misunderstanding the information here, but the keys are actually useless, even if you get your hands on all of them to attempt an incursion against the building where the KSK is, you would not be able to do anything because the security of that place is probably good enough to counter an attack like that, and supposing the attack takes place the other DNS servers would simply disconnect from the root and serve the information that they have until it gets outdated. So the only scenario that I can picture in my head is one where a terrorist attack goes against the building to disrupt the functionality of the whole system for anarchy reasons.