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I also removed the DRM on my first Kindle books, found it way harder with the last book I bought (and gave up)

Same here, it seems that amazon has improved its protection and changed its ebook format to harden it against DRM removal.

Easy enough to bypass by staying with an older version of the Kindle client. This downloads books in a format that Calibre (amongst others) can strip DRM from. There are instructions on the Calibre help site somewhere.

They changed the format of the files they send to your kindle or to a kindle app/software, but it is still possible to manually download the old format from the list of your books on the Amazon website.

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