How do you make sure only the eyes intended to see the data see it and nobody else? Why isn't this a concern with ADS-B, which allows anyone with the right equ

How do you make sure only the eyes intended to see the data see it and nobody else? Why isn't this a concern with ADS-B, which allows anyone with the right equipment (or access to a flight tracking website) to track planes in real time? And cost-versus-risk has been decided in favor of increasing cost (and safety) in numerous aircraft systems already. Also, if one factors in the cost of one more huge deep ocean search, a few more cents per ticket won't seem so bad. Who pays for these searches and investigations anyway - the airlines or governments (privatizing profits and socializing losses)?