sivni -siv- gismu

x1 is private/personal/privy/[secret/confidential/confined] to x2; x1 is not-public/hidden.

Also: x1 is secret (one sense); x2 is in the know/in touch with/privy to x1 (= selsivni for reordered places); exclusion can be expressed by na'e(bo) in x2: excluded/in the dark (= nalselsivni). See also gubni, mipri.

In notes:

x1 is public/un-hidden/open/jointly available to/owned by all among community x2 (mass).
x1 keeps x2 secret/hidden from x3 by method x4; x2 is a secret; x1 hides/conceals x2.
attitudinal: togetherness - privacy.
c1 is capitalism as practiced by p1=s2