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Okay, what is Calibre even FOR if not to remove the DRM?
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It's a program for managing a library of ebooks. It helps you catalog them and manage the metadata. It can be used as a reader on a PC. It can convert DRM-free ebooks between the file versions it supports.
It does not, by design, support stripping DRM.
However...
It has the ability to support plugins. Which are programs third parties write that can be called from the Calibre interface. One set of these is found at "Apprentice Alf's" blog. These plugins can be used to strip DRM. However we are prohibited from discussing the details on mobileread by the site policy. Refer to that blog to ask detailed questions about the use of these plugins.
I can refer you to threads about KFX - which is a relatively new format. It is possible to strip DRM from KFX, and it is possible to convert to and from it. But you need plugins, whereas older Kindle formats are supported natively. This and reasons to do with the format itself, are why many people prefer to force Kindle for PC to download non-KFX versions and go from there.
Thread about K4PC and KFX
thread about KFX Input plugin
HTH