[Etymonline :] ... privus "one's own, individual," from PIE *prei-wo-, from PIE *prai-, *prei-, from root *per- (1) "forward, through" (see per). ...
[AHI :] per1 ...
... from Latin prīvus, single, alone (< "standing in front," "isolated from others");
I'm confused because someone, who's "forward, through", sounds open and overt. But this appearance is contradicted by the evolution from the PIE root?