It is given to the Chosen One by Roger Westin, to be delivered to Joanne Lynette as part of the Deliver Westin's holodisk to Lynette in Vault City quest.
First Citizen Lynette;
The courier has delivered the disk you sent. You were correct, of course. The information should prove most useful at the next council debate. With what you have sent me I'm certain I can hinder, if not thwart, any further attempts at an NCR/New Reno Alliance.
I can only assure you that if given my way as I expect, there will be no more interference or provocation by the NCR in any of Vault City's affairs. I, for one, respect your sovereignty, and do not agree with the troublemakers who wish to deprive our innocent neighbors of their freedoms.
Your friend and ally,