YES!... if it's not a DRM'd epub. Unzipping the DRM'd type gets you useless scrambled info.
EPubs can be created from raw HTML and, umm, that other stuff (CSS? Metadata files that I don't understand at all?) and several people do exactly that. EPubs can be unzipped, have the CSS & metadata changed, re-zipped, change the extension back to .epub, and read with the new settings.
It's one of the reasons ePub is being pushed as *the* ebook format; non-DRM'd files are entirely end-user adjustable.
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EPubs can be created from raw HTML and, umm, that other stuff (CSS? Metadata files that I don't understand at all?) and several people do exactly that. EPubs can be unzipped, have the CSS & metadata changed, re-zipped, change the extension back to .epub, and read with the new settings.
It's one of the reasons ePub is being pushed as *the* ebook format; non-DRM'd files are entirely end-user adjustable.