The Kindle DRM wasn't hacked to REMOVE the DRM from Kindle purchases, but added to other books so that they too could be read on the Kindle.
Amazon can do a lot of money only from selling kindle, like Apple does with the iPod.
We've known for some time already that Amazon's AZW files are actually Mobi files, but Amazon didn't share Kindle's Mobi PID which would allow one to buy encrypted Mobi books for Kindle.
The Kindle has many flaws, but it does allow you to read a few different non-DRM formats.
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