Use Mobipocket software to convert PDFs to that format so you can read them on 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.
Non DRM Mobipocket format is already supported on the Kindle - just drag and drop.
Plenty of free e-books in Mobipocket format show up fine on Kindle.
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