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We propose a family of Secondary User (SU) power allocation schemes in spectrum sharing OFDM cognitive radio networks. The SU sum rates are maximized subject to a protection criterion for the Primary Users (PU) expressed through a utility function. We demonstrate that a specific choice of utility function leads to the maximization of weighted sum rate of all users, the weight being linked to a guarantee on the PU sum rate. Our formulation also allows trading off individual PU guarantees for higher SU sum rates, with a recently proposed scheme imposing individual PU Rate Loss guarantees being a limiting case.