Older Kindle for PC/Mac version 1.17 can sometimes be installed to work around this problem. Method 1 - Revert to an older version of Kindle for PC/Mac The following descriptions apply both to Kindle for PC and Kindle for Mac unless one is mentioned explicitly. There are several methods for either avoiding or handling KFX format. Unless additional steps are taken, these books will fail to convert in calibre with the error: "KFXError: This is an Amazon KFX book. Each book will appear in a separate subdirectory of the "My Kindle Content" folder with a file extension of ".azw". The Kindle for PC and Kindle for Mac programs use Amazon's KFX format for most books. There is also a new method (#6) using an old version of the Kindle for Android app described here.
(Details in this thread.)This means that methods 1, 2, and 4 described below are no longer effective for those books.
Convert the book from AZW to MOBI ( or any other format).Important update: Amazon has made a change to their service so the books published since can no longer be downloaded using Kindle for PC or Mac versions prior to 1.39. Download a Kindle ebook to your PC via Kindle App. Install the latest DeDRM 6.6.1, you can download the plugin files here. Install the KFX Input plugin, by following the guide here. This is just to make sure that Calibre can support whatever plugins that come along 
Update the Calibre to the latest version. Anyway Amazon turns on auto update by default. Update the Kindle App to the latest version. Thanks to the work of Apprentice Alf and some other people, DeDRM 6.6.1 can decrypt Amazon KFX format! We have tested the solution and it really works!. Won’t it be better if someone just make the DeDRM works with the latest KFX formats? And finally, the DeDRM 6.6.1 is now here… Those techniques are not straightforward, and require technical expertise to properly configure your software. Never upgrade to later version of Kindle App, stick with 1.19. The post goes on to suggest how one can workaround this issue. These books will appear in a subdirectory of the “My Kindle Content” folder, will import into calibre as “AZW” format, and will fail to convert with the error: “KFXError: This is an Amazon KFX book. The direct consequence of this action is that Calibre ( with DeDRM plugin) that many people love to use, can no longer strip the DRM off from Amazon ebooks, and can no longer convert the Kindle ebooks to MOBI or EPUB format. Starting from Kindle App 1.19 onwards, Amazon changes the format of the downloaded Kindle ebooks to KFX format. Use Calibre to remove DRM only when you are certain that you have the rights to read the books anywhere and in however formats that you want. Although it is not wrong to tell people how to remove the DRM( ie: this post is not wrong), we are not condoning piracy: we do not recommend you strip off the DRM and share/sell the books in violation of copyrights laws.
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