We're very fortunate that all Czech e-books are sold DRM-free. You can read them on any device without any hassle.
Unfortunately, as an owner of an old #Kindle I'm pretty much forced to buy English books on #Amazon. At least #Calibre / #DeDRM doesn't let me down and I can still read them on any device.
I promise I only use the books to train my LLM. And, unlike Meta, I actually purchased them.
