Yes, this is an epub question!
I'm embedding a number of fonts in my first epub, which I've managed to do successfully, but the freeware fonts that I'm using come with a EULA (End User License Agreement) file which states that it's free to use them "anywhere", as long as that EULA is included in the package.
They're just plain text files, and I presume it's good enough to just bury them somewhere hidden in the epub file where nobody will see them (unless they go poking around in there), but where would be the place to put them?
Can I just copy/paste the info from them into a new file in Sigil somewhere/somehow and have it included in there that way (in a "hidden" way), or would I have to unzip the whole thing and plop them in that way (and where?)?