NPR's Mary Louise Kelly talks with Brewster Khale, the founder of Internet Archive, about the attack by hackers that put the archive offline for days — and what may have happened if it had succeeded.

If you step into the headquarters of the Internet Archive on a Friday after lunch, when it offers public tours, chances are you’ll be greeted by its founder and merriest cheerleader, Brewster Kahle.

Just blocks from the Presidio of San Francisco, the national park at the base of the Golden Gate Bridge, stands a gleaming white building, its façade adorned with eight striking gothic columns. But ...