This article highlights the subordination of the seller's liability to the protection granted to the buyer in the context of the sale of someone else's property. The rationale behind the solutions of the Chilean Civil Code is illustrated through a historical and comparative analysis, identifying two peculiar features which set it apart from other legal systems: the inexistence of a general system of a non domino acquisitions and the burden of the buyer to defend himself with all available means in order to seek responsability from the seller.