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Amazon published some new update to Kindle and the new books seem to not be able to get unprotected. I used to use LD Player for this purpose. Now it doesn't work.
What I noticed is that the new book files are .kfx. There is some new file called amzn1.drm-voucher.v1. I think there might be the key to unlock the kfx archive file with the book contents.
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