It is typically proprietary to the processor manufacturer, and any necessary correctional microcode software updates are supplied by them to users (which is much cheaper than shipping replacement processor hardware).
See on tavaliselt salastatud protsessori tootja poolt ning kõik vajalikud mikrokoodi tarkvara uuendused varustatakse kasutajatele nende poolt (mis on palju odavam kui asendava protsessori riistvara kohaletoimetamine).