[NiLuJe]

@Rinzwind: It doesn't install a permanent publickey, but it uses the exact same exploit as the jailbreak in order to install an unsigned update.

Think of it a bit like the old 'no jailbreak needed' updates for fw <= 2.3 (-ex flag on the packager). The exploit is actually used directly in each update file, instead of a standalone jailbreak. (Which I think is way more useful/cleaner, which is why I didn't update the -ex flag in the packager).