In order to ensure legal certainty, this Regulation establishes a list of clauses that are always considered unfair and a list of clauses that are presumed to be unfair. In the latter case, the enterprise that imposes the contractual term should be able to rebut the presumption of unfairness by demonstrating that the contractual term listed in this Regulation is not unfair in the specific case in question. If a contractual term is not included in the list of terms that are always considered unfair or that are presumed to be unfair, the general unfairness provision applies. In that regard, the terms listed as unfair contractual terms in this Regulation should serve as a yardstick to interpret the general unfairness provision. Finally, non-binding model contractual terms for business-to-business data sharing contracts to be developed and recommended by the Commission may also be helpful to commercial parties when negotiating contracts. If a contractual term is declared to be unfair, the contract concerned should continue to apply without that term, unless the unfair contractual term is not severable from the other terms of the contract.