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I went through the epub and found that it had multiple errors according to Epubcheck. Some weird things such as fonts listed in the .opf using octet-stream instead of xfont-ttf, several jpg files listed in the guide section of the .opf (the guide section entries must point at a html/xhtml file), etc.
I used Sigil to do the checking and editing and after finishing the epub opened in calibre's editor and viewer.
One question is about editing a file that appears to have been deDRMed and is copyright 2008 by John J. Medina. Unless @sam222 is John Medina or has his permission to edit this file, things are very iffy with making it publicly accessible.
Is it possible to move that attachment to private status?
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