People stop to look at a tall set of Olympic rings after being illuminated in the harbor outside the Vancouver Convention Centre in Vancouver, in 2009. The IOC says NBC has retained its hold on U.S. Olympic television rights by defeating rival bids from ESPN and FOX and securing a four-games deal through 2020 worth nearly $4.4 billion. The victory extends NBC’s reign as the Olympic network in the United States, a period stretching back 20 years.