In a move possibly triggered by stories of deadly electrical shocks coming from Apple iPhone and Apple iPad units, the Cupertino based tech giant is blocking the use of unauthorized third party Lightning cables with iOS 7; those cables authorized for use with an iPhone or iPad, contain a chip that authenticates the cable allowing it to be used with the device...Source: http://www.phonearena.com/news/Apple-blocks-unauthorized-Lightning-cables-with-iOS-7_id47612
