[DiapDealer]

There's no need to go over this whole thing again, Jon. Nothing has changed from the last time: if the fonts are obfuscated in the KF8 file, they'll still be obfuscated when KindleUnpack is done with it. If the fonts are NOT obfuscated in the KF8 file, they WON'T be obfuscated when KindleUnpack is done with it. Period.

Don't believe me? Feed an epub with un-obfuscated fonts to kindlegen, and then unpack the resulting file with KindleUnpack. Notice the lovely UN-obfuscated fonts.

The fact of the matter is: you have no idea if the fonts in a KF8 file are obfuscated or not UNTIL you unpack it (unless you built the KF8 yourself and know for a fact).

Calibre is OK with removing font obfuscation during conversions and some of its "tweak" features (and that's fine; that's not my call)... but KindleUnpack isn't going to do it. It's that simple.