ePubs can have fonts embedded, but finding a legitimate source of such fonts is hard - most font foundaries forbid embedding in ebooks without additional fees.
www.fontmarketplace.com seems to be different, at least for ePubs that are distributed for free. Here's the first paragraph of their font licence:
Quote:
Permitted Uses
You are permitted to install the font onto the number of personal computers for which you have purchased licenses. You can use the fonts to create and design documents, and embed the fonts into documents such as PDF files. Files with embedded fonts can be freely distributed and posted on websites as long as they are not sold (what we refer to as "Commercial Documents").
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Also, their fonts are inexpensive. A single face is often $5, and a family of four faces $18. This is because they are only licensing the font for use on one computer. But if you're working on your own - that's all you want!
I have contacted them to enquire about commercial product licences too. I'll post once I have a reply.
Font Marketplace seems to be a website run by Ascender Fonts, which seems to be a legitimate font foundary. (& also sells through their eponymous web site at much higher prices and the usual "five computers and one printer with storage".)