Two, modern LDS men can be sealed to more than one living woman at a time, which is polygamy if you hold that being sealed for time and all eternity creates a "marriage" bond. If a man marries Wife 1, then divorces her civilly, but does not have their sealing cancelled, he can still marry Wife 2 for time and all eternity in the temple, thus having the same bond with two living women at the same time.
Thing is a man cannot get a sealing cancellation only a clearance. A woman who is divorced from hubby number 1 and wants to be sealed to hubby number 2 has to get a cancellation. Then I assume that the first sealing for hubby 1 is canceled from his view point as well.