I've got an ePub file that I'm quite certain has no DRM on it. It's a DRM-free book bought from O'Reilly. However, my Kobo Aura HD is refusing to use it, saying that it's Adobe DRM'ed and I have to log in.
So, first thing I tried to confirm is that it is DRM-free. Unzipping the ePub, it has no
rights.xml file, no
encryption.xml file, and all the content is available through plain html files.
epubcheck does't say anything about it having DRM. Is this sufficient to confirm that an ePub is DRM-free?
Second, if it is indeed DRM-free as it should, then the Kobo Aura HD is incorrectly indicating that it has DRM. It is refusing the display the file even though it displays fine in every other reader I've tried, including iBooks and Calibre, neither of which I've logged into any accounts.
Any remedies that I can use to fix this? Perhaps somehow repackage the ePub?