Most of the e-books, videos, video games, and mobile apps that we buy these days day aren't really ours. They come to us with digital strings that stretch back to a single decider—Amazon, Apple, Microsoft, or whomever else. Steve Jobs has confirmedthat every iPhone routinely checks back with Apple to make sure the apps you've purchased are still kosher; Apple reserves the right to kill any app at any time for any reason. But why stop there? If Apple or Amazon can decide to delete stuff you've bought, then surely a court—or, to channel Orwell, perhaps even a totalitarian regime—could force them to do the same. Like a lot of others, I've predicted the Kindle is the future of publishing. Now we know what the future of book banning looks like, too.