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Re:Ask HN: What is Marc Andreessen talking about by AlchemistCamp on Friday April 08, 2022 @05:35AM (#30955052)
I'm not familiar with Calibre but AFIK, all kindle books have DRM.
Re:Ask HN: What is Marc Andreessen talking about by drakonka on Friday April 08, 2022 @07:23AM (#30955627)
It is a setting the author chooses when publishing their book through KDP, and some authors choose not to enable it. Pretty sure it is enabled by default though.