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.
Use Mobipocket software to convert PDFs to that format so you can read them on Kindle.
Plenty of free e-books in Mobipocket format show up fine on Kindle.
How do you load other eBooks onto the Kindle? Just add Amazon DRM.
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