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Old 02-12-2013, 06:25 AM   #6
davidfor
Grand Sorcerer
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Posts: 6,090
Karma: 6238033
Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo Touch, Kobo Glo
Quote:
Originally Posted by kc7zzv View Post
A kepub is a format developed by Kobo based off of epub. It's (almost) an epub with a few files added, the main "html" doc broken into smaller chunks, and extra tags added.
Quote:
Originally Posted by kc7zzv View Post
I want input and output support, but since a kepub is an epub, I'm hoping it'll be almost free. The only non-conforming part that I know of is extra attributes in the span tags, which I assume the parser will happily ignore.
This is a little picky, but the "broken into smaller chunks" is wrong. The division of text into files in kepub is exactly the same as for epub. I have compared the kepub and epub versions of books I have bought from Kobo, and in general they are the same. None of the extra code is illegal. There are extra spans with a Kobo specific class and a sequential id.

If you want to do this, go ahead, but I don't think it is very useful. While any non-DRM protected kepub can be treated as an ePub, the extras aren't useful anywhere outside a Kobo device. Kepubs can be read with the Kobo iOS or Android apps, but I think they can only read those download from Kobo by the app.

If you want to use an epub as a kepub on the devices, then all you need to do is rename it to have ".kepub.epub" as the extension. That gives most of the "advantages" of a kepub.

There is also no point in adding DRM protected kepubs to calibre. You can't read them and you can't remove the DRM. And I don't think you can put them back onto the device and read them.

Finally, there is already a driver being developed to send epubs to the Kobo devices as kepubs. This is at https://github.com/jgoguen/calibre-kobo-driver. This does the updates to the epubs when the book is sent to the device. I will be merging this into the current driver when I am happy that it works well and I have time. Last time I checked, it would handle at least 90% of the epubs out there. The ones it doesn't would probably work after a calibre conversion. This has been discussed in the Kobo forum.
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