I know Snowden's parents, and his mother sent a copy of my book. I said, “Do you want it in digital form?” She said, “No, I can get stuff to him in Russia.”
He definitely did a service, there's no question about that, and in some subtle ways. For example, last year the United States Department of Defense had a “hack the Pentagon” contest. You had to be an American. You had to be a certified white hat hacker. They actually got bug reports about their own system. It's an admission that nothing can be fully secured, and there was the U.S. Pentagon admitting that. I'm not sure if that would have happened if it hadn't been for Snowden.