When you apply to own a piece of land, the Registrar must cancel any old documents that say who used to own it. The Registrar does this when they register you as the new owner of the land. If the old document also talks about other land, the Registrar will add a note to it saying it is cancelled, but only for the land you now own. You can find more information about this by looking at s 30. The Registrar's job is to keep track of who owns the land. They make sure the documents are correct and up to date.