That is the problem here. The Kindle is not a device specific thing, it is hardware and mostly the software that is available on all devices. I do not own a K

That is the problem here. The Kindle is not a device specific thing, it is hardware and mostly the software that is available on all devices. I do not own a Kindle, I own many Kindle books. So if I buy one on my PC a while back, then go to my Kindle app on the iOS device and then Amazon has to hide it because it wasn't bought there? This is actually Apple, which I own many products, being anti-competitive on allowing other bookstores at all besides iBooks. This will force possibly the market to go more PDF and away from DRM, maybe a good direction in the end. Amazon should switch to PDFs. Then you can load those up in iBooks.