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What Amazon Kindle? Here's an Open Source eBook Reader
(itsfoss.com)
This is a most excellent place for technology news and articles.
Think I did it that way for some books.
I also seem to remember there being another workaround, by exporting it to my old sony e-reader via the official sony app, which is so old it doesn't have proper DRM, but I did have to sign up for adobe digital editions or some or other BS. Something like that. End result was a DRM free epub.
Huge waste of time, especially for something I'd paid full price for, so after that I gave up on buying ebooks, and simply pirated them.
Just like with DVDs back in the day and streaming now, you get a shittier experience if you pay full price. Better to pirate.