Quote:
Originally Posted by dragoworld235
I use the editor to "clean" epub: updating it to epub3 if needed, optimizing images, removing unneeded css, beautifying the html…
My editor was set to update the metadata from calibre to the epub when saving the modifications, thus saving to the epub things like custom columns.
This is now fixed.
The comment I'm talking about are not in the opf but directly in the html files for each pages. I try to buy books without drm when I can (or else kobo store + obok dedrm) but I clean the watermarks that my book shop set as html comments containing identifying data (e-mail, customer id, transaction timestamp, etc.). I'm using the editor search and replace feature to remove them ATM. But as I also have to check the opf for identifying metadata and sometimes xml comments in it or the toc, I will keep doing it with the editor.
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I don't understand the need to update an eBook in ePub 2 to ePub 3. Do you actually need any ePub 3 features that you cannot get with ePub 2?
I don't have Calibre update any of the metadata in the ePub. If I need/want anything changed, I'll do it myself in the editor.
I prefer to download ePub from Kobo. That way, I have the choice to read it as ePub or KePub. IMHO, ePub is better as a source format then KePub because ePub doesn't have all the koboSpans and the HTML is a lot easier to edit/read.
As for watermarks, I've not seen any in an ePub. But one thing that I have read of (that you've not mentioned) is putting watermarks in the image metadata. Do you have a program to check for that?