Also, if you have to have the fonts viewable in most ePub readers and don't want to "give out" the fonts so others can use them for whatever, you can keep them no obfuscated and use Calibre to subset the fonts such that they only contain the characters in your ePub. This makes the fonts rather useless for any other purpose. Plus, any unused fonts will be removed fully. So if you have a bold italic font and it's not used, it gets removed.
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