A video encoding method includes selecting one combination, for each block of an input video signal, from a plurality of combinations. The GPS receiver 2 encrypts the latitudelongitude information, and transmits this information as position information to center system 4. An indication is received that the lottery entry is to be active in at least one second lottery drawing if the lottery entry fails to qualify for a prize in the first lottery drawing. The method alleviates this possibility of missing packets and bad data integrity by using SHA-1 verification of the file pieces.