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Oh, that sounds very likely. I wonder what algorithm they're using. I guess they must do it at their end, as fonts aren't obfuscated in the output of Kindlegen.
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I think it's done in the ePub, actually. But maybe it's different in this case—since even obfuscated fonts continue to
work in epub readers, you just can't extract them and use them for anything else (regardless of DRM).
Hmm... never mind. It must be something else (or different obfuscation). ePubs using either Adobe's or IDPF's obfuscation (applied with Sigil) result in embedded fonts not working at all when run through the latest kindlegen.