Hack let you convert encrypted Mobipocket files that were intended for another reader so that that work on Kindle.
As glued to the net as we all are, there's vast quantities of content that is not available online.
Non-DRM Mobi books, like free e-books found online in Mobi format, or files you convert to Mobi files, are already supported on Kindle.
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.
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