Libya's oil sales contribute significantly to the country's export earnings, making the industry one of Muammar Gaddafi's main financial pressure points.
The international community has been trying to prevent the Libyan leader from obtaining revenue from sales, as his regime's violent crackdown on protests continue.
But the web of international sanctions on the government still has some gaps, as companies from China, India and Austria continue to buy Libyan oil - completely legally.
Al Jazeera's Rory Challands reports.
Source: Al Jazeera