How to Remove DRM from KFX-ZIP Files?

Many ebook enthusiasts prefer using Calibre to organize, convert, and manage their eBooks in various formats. If you own Kindle books, you might encounter a situation where the resulting format of your Kindle KFX files becomes KFX-ZIP after importing them to Calibre. Consequently, you can neither convert nor open this KFX-ZIP file in Calibre due to DRM protection. To use this file for backup purposes or personal uses, DRM removal is necessary. In this tutorial, you will learn how to remove DRM from the KFX-ZIP files.

1. What is the Difference between KFX and KFX-ZIP File?

First things first, you will only encounter a KFX-ZIP file in Calibre. Books in KFX format delivered by Amazon are a bundle of files composed of an encrypted main container, a metadata container, a DRM voucher, and auxiliary containers (zero or more). Each of these contains only a part of the book's content and cannot be converted individually. KFX container files typically have a '.kfx' extension, though other extensions ('.azw', '.azw8', and '.azw9') are used by some software.

Generally speaking, Kindle KFX files are DRM-encrypted.

However, after importing a Kindle KFX file into Calibre, if the resulting format is KFX, it indicates that this file is DRM-free now. If the resulting format is KFX-ZIP, then DRM removal has failed. Therefore, a DRM Removal tool is needed to get rid of DRM.

2. Why You will Get KFX-ZIP File?

When you add Kindle KFX books to Calibre, you will come across a KFX-ZIP file only if you have installed the KFX Input plugin, and no functional DeDRM plugin is installed in Calibre. Why did this happen? The reasons are as follows:

If the KFX Input plugin is installed, it converts the book from KFX to KFX-ZIP upon import. Typically, the next step involves the DeDRM plugin (if installed) removing any DRM. The KFX Input plugin then converts the KFX-ZIP back to KFX. However, in this case, the DeDRM plugin is not installed, and DRM cannot be removed. Consequently, the KFX Input plugin does not convert KFX-ZIP back to KFX. Therefore, the resulting format in Calibre is KFX-ZIP.

3. How to Remove DRM from KFX-ZIP Files?

In Calibre, users can leverage two powerful plugins: the DeDRM plugin and the KFX Input plugin. The DeDRM plugin is specifically designed for removing DRM, while the KFX Input plugin is utilized for importing DRM-free KFX books into Calibre. It enables users to manage and convert these DRM-free KFX books to various formats, including PDF. Below are detailed steps to remove KFX DRM using the Calibre plugin:

Step 1Download and Install Calibre.

Ensure you have Calibre installed on your computer.

Step 2Download DeDRM Plugin and KFX Input Plugin.

Download both the DeDRM plugin and KFX Input plugin from the official repository.

Make sure to unzip the DeDRM_tools plugin package before trying to load it into Calibre. Failure to do so may result in encountering the following error.

Step 3Install DeDRM Plugin and KFX Input Plugin.

Open Calibre. Navigate to "Preferences" > "Plugins." Click on "Load plugin from file" and select the DeDRM plugin and click "Open".

Next, click "OK" in the following pop-up alert window and click "Restart calibre now" for the plugin to take effect. And repeat the same steps to load and KFX Input plugin into Calibre(Don't unzip the KFX Input plugin package).

Step 4Add KFX Books to Calibre.

Click on "Add books" in Calibre and select the KFX files. Alternatively, you can simply drag and drop the KFX files into calibre. Ensure that the resulting format is KFX, confirming the successful removal of DRM.

Step 5[Optional]Convert KFX to Other Formats.

The KFX Input plugin for Calibre is essential for the conversion task. Once you've installed the KFX Input plugin in Step 3, converting DRM-free KFX books to your desired format is straightforward. Simply click on "Convert books", then select your preferred output format.

   

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