Modern Warfare 2 hits 20m sales

Activision has told a gathering of analysts that Modern Warfare 2 has sold more than 20 million units worldwide.

That's according to a GameSpot report on the event, which also noted that CEO Bobby Kotick has designs on the second-hand market.

According to the report, Kotick reckons there's $500 million of money to be made by working with retailers to take a cut of sales of used Activision titles.

At the moment publishers make no money off second-hand sales around the world, which has led games company to take measures like EA's Online Pass and THQ's redeemable UFC code.