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The question is, do you have a license to use these fonts in your eBook or are they free for use in an eBook?
Also, using Calibre, you can subset the font instead of obfuscating. Once subset, the font is not going to be useful outside of that eBook because any characters not used by the font have been removed. But, one thing you'll need to check is if the fonts have enough weight for an eInk screen. Too many embedded fonts don't and that can make the eBook hard to read.
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