South Africa copy right

Generally maps of any kind are copyrighted in essentially all countries or the world and can only be used for OpenStreetMap if there are special circumstances:

• the terms the map are published are "open" and allow derivatives to be distributed on the terms of the ODbL
• copyright of the map has expired (that is essentially only the case, with a few exceptions, for maps that are from very early in the last century depending on how they were published)
• you have special permission and can document that.

Note that besides copyright there may be other national regulations that make using the map illegal.