DISPLAY APPARATUS, BROADCAST SIGNAL RECEIVING APPARATUS AND CONTROL METHODS THEREOF

A display apparatus, a broadcast signal receiving apparatus and methods thereof are provided. The display apparatus includes a signal receiver configured to receive data of content, a display configured to display an image, an interface comprising interface circuitry configured to communicate with a security processing module, and a processor configured to transmit first data of the content to the security processing module in response to a recording event of the content, to receive and store second data and information of a security identifier of the content from the security processing module, and to display an image of the content to which the security identifier is added based on the stored second data and information in response to a play-back event to the content. Accordingly, if the content is recorded and then played back, the security identifier may be displayed in the played-back image of the content, thereby protecting the played-back content enough to prevent and/or reduce unauthorized use thereto.