Quoting the article: "A new safety system has been put in place allowing much of the net to be shut down in an emergency. It would be down to Mr Kane and five colleagues to switch websites back on after giving the all-clear."
The article goes on to say DNSSEC ensures that websites are "officially approved".
Slashdot covered the signing of the root zone earlier.
Link to Original Source
'Better Jupiter than Earth,' say astronomers
I think I speak for all of us Jupiterian slashdotters when I say I have a problem with that statement.