NEW: Apple launched a new security feature specifically to fight against spyware and zero-day exploit makers.

We spoke to a researcher who sells zero-days to the U.S. government, who thinks this will make their life much harder and raise the cost of developing and selling hacking tolls for iPhones.

“It’s not hack proof. But it’s the closest thing we have to hack proof. None of this will ever be 100% perfect. But it raises the stakes the most,” the researcher said.

Other cybersecurity experts agreed that this is a big deal, and can have a significant impact in making the new iPhones the most secure devices on the planet.