as far as the error, let me correct myself, this is a warning. page-map is used for refernce linking and index linking and references pagemap.xml.
For now, it's ignored.
checking these epub files, I am wondering, does the checkers check for everything? I mean, does it validate the structure? are there things that the checker will pass, and it's an error and can cause unwanted results.
I figured you are not a big fan of DRM, I am not either. But it's an option and I would like to explore it. So, if you or someone else can guide me to test some DRM that would be great.
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