Any person who violates Section 25402 shall be liable to the person who purchases a security from him or sells a security to him, for damages equal to the difference between the price at which such security was purchased or sold and the market value which such security would have had at the time of the purchase or sale if the information known to the defendant had been publicly disseminated prior to that time and a reasonable time had elapsed for the market to absorb the information, plus interest at the legal rate, unless the defendant proves that the plaintiff knew the information or that the plaintiff would have purchased or sold at the same price even if the information had been revealed to him.