It meant that the Democratic Republic of Germany had the supreme power to govern over the territory of East Germany while the Federal Republic of Germany had the supreme power to govern over the territory of West Germany. Sovereignty was essentially frozen, and neither of the two sides talked about sovereignty.
指東德有對東德領土的統治高權，西德也有對西德領土的統治高權，主權等於冰凍起來了，雙方所以不談主權。