What do you mean by standard lock code?

The new high-definition multimedia mobile multimedia broadcasting and TV technology is adopted to realize satellite transmission and digital set-top box to receive and watch live TV programs. SD means that the physical resolution of the video is below 1280P times 720P, and the lock code means that the barcode of the goods that are under-sold or have duplicate types is locked, so it is not allowed to sell, and the store purchase plan cannot be generated.