The history behind the QR codeTo play this video you need to enable JavaScript in your browser.This video can not be playedThe history behind the QR codeCloseWatch the full episode on BBC iPlayer.SubsectionAsiaPublished1 day agoShareclose panelShare pageCopy linkAbout sharingRelated topicsJapanFollow Japanclose panelYou are now following JapanUpdates from your News topics will appear in My News and in a collection on the News homepage.Read description