Daesh (ISIS) is issuing an official license to loot, and by doing so, creating a steady stream of income in areas under its control. 

Nearly two months ago, the US State Deparment released formerly classified documents that proved Daesh is systematically profiting off of looted antiquities. Documents showed the militant group — now controlling swaths of territory in Iraq and Syria — created an antiquities department to provide residents with looting licenses.

In exchange, Daesh gets a nice chunk of the excavators' profits as "tax." The US says that's generally about a 30 percent cut to the militants, though another report says a man was charged as much as 60 percent.