The transmission isn't being interfered with. Along with the sound and picture, engineering data is present on a transmission. You may have seen this on older analogue TVs as an occasional black band at the top of the screen with white dots running through it. The data includes program type, timing information, etc. If new software version information is received in this way, and it doesn't match that stored in your TV, the TV will show an upgrade recommendation. Usually, it's for your benefit as a viewer.