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The ability for anyone to produce unencrypted KF8 books using kindlegen was a significant factor in reverse engineering that format. The apparent encryption of all KFX books (including public domain works that are encryption-free in other formats), along with the lack of a tool to generate KFX on demand, are obstacles to deciphering that format. I am certain they will be overcome if the need arises.
One thing that came to light a while ago is that KFX was originally developed to support interactive magazines on Fire tablets. I purchased one of the new inexpensive Fire tablets recently and also purchased a magazine issue for it. I found that it was visible on the tablet as a set of unencrypted KFX files in a freely accessible directory. That may provide a means to discover more about the format, though there are possibly differences between the book and magazine variants.
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