Use Mobipocket software to convert PDFs to that format so you can read them on Kindle.
As glued to the net as we all are, there's vast quantities of content that is not available online.
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.
Plenty of free e-books in Mobipocket format show up fine on Kindle.
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