Broadcast signal transmission/reception device and method

A method of processing a supplementary content in a digital broadcast receiver, the method comprising:

• receiving an audio component and a video component for a broadcast service, wherein video watermark payload is inserted in the video component;
• decoding the audio component;
• decoding the video component;
• extract the video watermark payload from the video component;
• presenting the supplementary content based on the video watermark payload,
• wherein the video watermark payload comprises at least one watermark message block having a watermark message identification (ID),
• wherein the at least one watermark message block comprises a display override message or another message based on a value of the watermark message ID;
• presenting the video component without any overlaid graphics for a specified duration based on override duration information included in the display override message.

A transmitter for delivering a broadcast service, the transmitter comprising:

• a processor configured to generate an audio component, a video component, service layer signaling (SLS) information for providing information for discovery and acquisition of the audio/video components, and service list table (SLT) for providing access information related to the SLS information,
• wherein the processor is further configured to insert watermark information into the video component,
• wherein the watermark information comprises at least one watermark message block having a watermark message identification (ID),
• wherein the at least one watermark message block comprises a display override message based on a value of the watermark message ID,
• wherein the display override message is used to provide an indication that, for a specified duration, the video component is expected to be rendered without any overlaid graphics;
• and
• a transmitting module configured to transmit the watermark information being inserted into the video component, the audio component, the video component, the SLS information and the SLT.

A digital broadcast receiver for processing a supplementary content, the digital broadcast receiver comprising:

• a receiving module configured to receive an audio component and a video component for a broadcast service, wherein video watermark payload is inserted in the video component;
• an audio decoder configured to decode the audio component;
• and
• a video decoder configured to decode the video component and extract the video watermark payload from the video component, wherein the digital broadcast receiver is configured to present the supplementary content based on the video watermark payload, wherein the video watermark payload comprises at least one watermark message block having a watermark message identification (ID), wherein the at least one watermark message block comprises a display override message or another message based on a value of the watermark message ID;
• wherein the digital broadcast receiver is configured to present the video component without any overlaid graphics for a specified duration based on override duration information included in the display override message.