DRM is not to prevent other files from being readable on the Kindle.
The hack allow ENCRYPTED Mobi files to be read on the Kindle. So you can buy a DRM-protected mobi book and read it on Kindle.
Hack let you convert encrypted Mobipocket files that were intended for another reader so that that work on Kindle.
Amazon can do a lot of money only from selling kindle, like Apple does with the iPod.
A revolutionary portable reader that wirelessly downloads books, newspapers, magazines and blogs to a crisp, high-resolution electronic paper display that looks and reads like real paper, even in bright sunlight.