Quote:
Originally Posted by BBouy
I am trying to find out what is the difference in structure from version 2 to version 3.
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The biggest differences will be...
1. The table of contents. toc.ncx is used by epub2 and nav.xhtml is used by epub3 which is not referenced in the spine. The formatting will be very different between the two. Its pretty easy to recreate the toc.ncx, so that shouldn't be a stumbling block.
2. The content.opf is modified and has a json type structure in epub3
3. Then there are all the little css differences that might catch you out. Probably best to upload your book so the css and html tags can be checked.
You can scramble the book if you are concerned about security. Install this calibre plugin...
https://www.mobileread.com/forums/sh...d.php?t=267998
Other members will be able to point out more differences, or if there is even a plugin which allows you to downgrade. I am not aware of one, but I've never looked for one either.