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.
There are converters available from Amazon and/or Mobi for pdf and doc files.
As glued to the net as we all are, there's vast quantities of content that is not available online.
Hack let you convert encrypted Mobipocket files that were intended for another reader so that that work on Kindle.
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.