Amazon can do a lot of money only from selling kindle, like Apple does with the iPod.
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.
The Kindle supports Mobipocket files directly. You don't need to write a script to do that.
DRM is not to prevent other files from being readable on the Kindle.
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