 In 1939 and 1940, a new name-change policy came into effect by means of Ordinances No.19 and 20.Originally, as in Taiwan, the new name-change policy was intended simply to allow change of surname ("sei"/"seong") and given name, but because Korea had a long-established custom (recently abandoned) whereby people of the same "bon-gwan" (surname and clan) were not allowed to marry each other, in order that this custom could continue, it was decided that the policy would be implemented by leaving the clan name and "sei" the same in the family register, while permitting a new family name ("shi"/"ssi") to be registered.