Did North Korea Hack Sony Pictures as Payback over a Movie?

A sophisticated cyber attack on Sony Pictures has wreaked havoc on the studio in Culver City, California.  Five major films were stolen, exorbitant executive salaries were revealed and the computer system was essentially wiped out.  Private consultants warned comedy star Seth Rogan and Evan Goldberg, director of the new film The Interview to change their bank account passwords... warning "we're not kidding." They warned that North Korea might retaliate for the satirical film about assassinating that country's leader Kim Jung Un. We hear two theories about what happened.