I've now heard back from Font Marketplace. They say that if the font is embedded in the ePub using font obfuscation, that's good enough for them. They'll have some official wording on the subject, which I will post here when it's available.
Quote:
Originally Posted by HarryT
Be careful with this. The licence permits fonts to be embedded. Fonts in ePub files are not embedded, as they are with the PDF file, but are simply contained in the ePub ZIP file, from where they can simply be copied by the user and installed on their own system. The point about an embedded font is that it becomes a part of the document, and cannot be "unpacked" and re-used by the document viewer.
I honestly don't think the licence you've quoted is valid for ePub usage.
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