Quote:
Originally Posted by menevets
I downloaded a DRM free technical paper, Human Interface Guidelines, from iBooks. It has an epub suffix and is actually a directory with subdirectories named OEBPS and META-INF.
I want to read this on my Android tablet. There's no DRM, but I can't convert it to ePub. Pdf would be fine too. I tried zipping it up and converting it in Calibre, but that gave an error.
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You can't just zip it up. EPub has particular build requirements (see our wiki). Did you try Calibre on the original?