ferrari would be allowed to keep their current NT livery, because the white engine cover is just a white engine cover, not specific to any brand (although any F1 viewer would know that the word 'marlboro' is missing).
they would not be allowed to keep the 'roof' triangle white shape though, like they used to do.
mclaren on the other hand would not be allowed to write 'Kimi' or 'David' (or 'Juan'
the way they do now, because that is exactly the same style as when they write 'West'.
and Jordan would not be allowed to keep 'Be On Edge'.
RIP Jules, never to be forgotten. #KeepFightingMichael