Patent ID: 8102920

Claim:
A method of processing a digital broadcast signal including mobile service data, the method comprising: first randomizing the mobile service data; building a Reed Solomon (RS) frame including the randomized mobile service data, the RS frame being a two-dimensional data frame through which the mobile service data is RS encoded at one of a plurality of RS codes and Cyclic Redundancy Check (CRC) encoded; dividing the built RS frame into a plurality of RS frame portions, each of the RS frame portions having a length of PL bytes; encoding signaling data including transmission parameters for signaling the mobile service data; forming data groups, each of the data groups including data of each of the plurality of RS frame portions and the encoded signaling data; forming mobile service data packets including data in the formed data groups; multiplexing the mobile service data packets with main service data packets including main service data; second randomizing data in the multiplexed main service data packets and a portion of data included in the multiplexed mobile service data packets; and transmitting the digital broadcast signal including the randomized data and another portion of data included in the multiplexed mobile service data packets, wherein the mobile service data includes video data, and a picture of the video data includes blocks.