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BTW, I own a better paid alternative to Calibre. (I also have Calibre but never managed to remove DRM using it).

I'm using ebook DRM remover software bought here:
https://www.ebook-converter.com

I also have this one (cheaper):
https://www.epubor.com/adv/kindle-drm-removal.html?3317600&gclid=CjwKCAjw96fkBRA2EiwAKZjFTYhbkdbhZPdyWVXwmNDHiOaTs46CntRAhTARqEtDVMLlcJ4lM2kybRoC3EwQAvD_BwE

Unfortunately, I never managed to remove DRM from ebooks I did not buy because of encryption issue. I have to log in and connect to the Amazon account in order to remove DRM... so it's not convenient and nobody would be willing to share its personal Amazon information, which is totally normal.

I have to try and create an Amazon Jp account so that I can buy and share kindle...