EPUB actually is an open format. I believe it can be locked down, but EPUBs are available in an unencrypted non-DRM fashion.
Not sure if you can extract them from an Amazon device. It may be possible.
If your ethical guidelines would allow it, you could also see if this library has an EPUB copy of the book you already own.
https://annas-archive.org/
Pretty sure Amazon kindle doesn't use epub. Many years ago there was software that could convert their format to epub but would be very unsurprised if that is no longer possible.
Calibre
Amazon uses a couple that are easily convertible any which way with Calibre
Right. So still works then? That's cool.
Absolutely works brilliant
I also Calibre-web docker for accessing books when kindle not in hand.
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If you’re in to reading ebooks this is important to have
https://calibre-ebook.com/
Or an ebook reader, ebook management, and most importantly ebook converter. Take any format and make it another. For example epub to something kindle can open
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