which part of IM is this ?

if i want to define a datum in terms of who owns what, what branch of IM is it ? (yes i know it's not a computer-bound thing)

f'rinstance SSN...

a SSN is a conduit between the govt and a unique citizen (who's decided to join The System).

It's issued by the govt.

An employer may have an SSN on file, but they have no use for it, it's simply passed on to IRS (who does have a use for it).

Anyways, I'm trying to find a language subset or hopefully a discipline that deals with rights/obligations in regards to data, in a quantizable fashion.

(sorry to be so vague)