"Last week’s RSCs are somewhere between TSCs and PSAs. It’s a model that has been used in Latin America, and is very similar to the “buyback contracts” used in Iran. The foreign company invests the capital (like in a PSA), but rather than getting a share of the oil, it gets a specified rate of return on its investment (say, 15%). And after a number of years, the oilfield reverts to national control. The government has not released the details of the contracts; but it appears they would be for either 7 or 9 years (in contrast to 22 years for a PSA or 1-2 years for a TSC)*." (thanks Sinan)