Column level security

Dear All,

Is there any way to implement column level security in Oracle 9i database ?

Information on having row level security through VPD is available. But is it possible to have column level security ?

I have seen in some sites,like
(http://www.ftt.co.uk/C520_outline.html,
http://www.actisit.com/outlines/forms/Or202_Or9i%20DBA%20I%20outline.pdf)

mentioned about column level security.

Can someone help me in this regard?

Pradeep

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