Even without my number the retailers know my e-mail or whatever else I used to sign up for their loyality cards or benefits, they already know what I buy. If th

Even without my number the retailers know my e-mail or whatever else I used to sign up for their loyality cards or benefits, they already know what I buy. If they know my personal number, then they can't know anything in addition to what they would have without it. But having strong protection for privacy is a must also. Every time someone accesses my data in the national registries the access is logged - who did it and when. For example I can see that the city I live in is checking if I still live there, because they offer free public transport to residents. Also I can see that the doctor I visited looked at my data, maybe also the aphotecary where I got my prescribed medicine from, because.. all the prescriptions are also digital documents, very-very rarely something is put on paper (for example, when a vet doctor prescribes some antibiotics and I can get them from the apothecary). Othewise I just give them my id card, they look at the number, type it in, and can see what I have been prescribed.