A system of public broadcasting was established in 1973. For reinforcement of public management, 1TV and Radio1 have not run a commercial since October 1994. First broadcasting HD programs in 2001, KBS completely transferred to digital broadcasting in 2012. In addition to 18 regional stations and 11 overseas branches, there are eight subsidiary companies such as KBSN, KBS Business and KBS Media, which manage KBS content.