Quote:
Originally Posted by kovidgoyal
Interestingly that file seems to have been created/edited with Sigil and then post-processed by some tool to encrypt all the HTML files and then base64 encode them. I can see no indication in any of the metadata files that the file is DRMed, so detecting it in calibre is problematic.
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Would it be possible to check that if content.opf and/or toc.ncx start with "<?xml version="1.0" encoding="utf-8" ?>" and the HTML text files do not as an indication that the epub uses Deseret's encryption? Or even that the first character of the html text files is not "<"?