Thanks for the answers. I Drag/drop the .kfx files from the Kindle to calibre. But unfortunately doesn't work and I see always the format KFX-ZIP (protected by DRM. I tried also to drag/drop all the files of the book (.sdr etc) but it doesn't work. It hasn't been working for two days. Three days ago I bought a Kindle and Calibre unprotected it. I'm afraid Amazon introduced a new DRM protection two days ago.
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