Even if you don’t break the DRM, having the file is a guarantee that they con not modify the version of the book you payed for, or remove it from your library (both things had happened in the past).
Having the file is the first step in removing the DRM - you can set DeDRM up as a plugin in Calibre to strip DRM automatically when you add the AWZ3/KFX file to your library.
Does this make a big difference? Even if you have the ability to download the books from the website, they are still DRM protected, no?
Even if you don’t break the DRM, having the file is a guarantee that they con not modify the version of the book you payed for, or remove it from your library (both things had happened in the past).
Having the file is the first step in removing the DRM - you can set DeDRM up as a plugin in Calibre to strip DRM automatically when you add the AWZ3/KFX file to your library.