I am pretty sure yes you will have to research every font. Some fonts are licensed only for personal use when bundled with e.g. MS word.
Even if you are licensed to benefit from commercial use of the font, your non-automatic right to do so may additionally be restricted due to the requirement to obfuscate it.
I think Kovid is right in claiming font obfuscation is mere security theater.

But so is DRM and that never stopped the screaming lawyer-encouraged hordes...