 Subsequently, the Privy Council issued many opinions confirming the existence of aboriginal title, and upholding customary land claims; many of these arose in African colonies.Modern decisions have heaped criticism upon the views expressed in "Southern Rhodesia".The requirements for establishing an aboriginal title to the land vary across countries, but generally speaking, the aboriginal claimant must establish (exclusive) occupation (or possession) from a long time ago, generally before the assertion of sovereignty, and continuity to the present day.