mortgages public knowledge??

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hey guys and gals,
i know how to access a lot of info i need through tax and county websites ...GIS and Polaris are both amazing...i have heard that mortgage info is public knowledge as well, although i have not seen proof of this..without directly asking the seller, does anyone know how to find out what people owe on their homes?? i suppose you could estimate by finding sales price, but you still don't know interest rate, their downpayment, or how much they pay...they could be paying extra each year, and thus owe less than you would think...help all..let me see your wisdom!! thanks.