Preferential Rule – within the meaning, given by the Civil Law in some legal systems, the preferential rule appears in Court Trials, where gives bigger legal value to evidence, compared to another. For example, the original of a signed contract has a bigger value as proof, instead of just a photocopy of the contract. The term is connected with the term “preponderance”, which means to be superior in the value of proofs. So the original of the contract will be preponderance proof, if compared to the photocopy.