Doctorow makes a big deal about contracts and so forth, so as to blame Amazon. But that's like blaming Oscar Meyer for the fact that bologna isn't made out of free-range heritage-breed pork: eventually the consumer will learn what's actually in the package. Of course contracts between companies play a role, but from the consumer perspective this is what you "own" when you purchase DRM'ed media. All DRM'ed media will be taken, eventually. Don't buy it unless you're comfortable with that fact.