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Your EPUB Is Fine. Kobo Disagrees. Blame Adobe - André Klein Dot Net
(andreklein.net)
This is a most excellent place for technology news and articles.
libgourou has no need for anything that has to do with Kobo. It's really only three cli commands: activate (once), download acsm, de-drm. It produces an unencrypted .epub that you can open as is or copy to your Kobo device with any ordinary file operation.