Font embedded in an ebook
Unless it's an open source font, or licensed free for personal use it's copyright violation to use it for any other ebook even on the same ereader, even for personal use. But they would have to sue you.
So in practice you can do what you like as as long as you don't upload or give a copy to someone with the unlicensed font copy.
Just like the rest of the content of the ebook actually. This is not complicated.
The Snag!
Even most fonts that are open source (or licensed for free personal use) are typically sub-setted. This saves a lot of space for headings and such. Some regular body fonts are huge, so sub-setting them is common.
So madness even to consider reusing a font from an ebook even if you think it's free, or it's only for personal use. Go and download a font. There are even genuinely free ones similar to some nice expensive ones, so don't download from dodgy sites.
Any font on your PC (Linux, Mac, Windows) can probably be used for personal ebook use, but don't assume (even on Linux) that they can be used for publishing (free or commercial makes no difference). Publishing means distributing copies – nothing to do with if the copies are free or sold.
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