English to Italian Law/Patents Law: Contract(s)

mi pare di capire si tratti di un accordo per adeguare i costi ma non mi viene in mente quale può essere l'equivalente italiano. Grazie.
"in the event the contractor desires to make any changes in the copyrighted work which in the judgement of the licensor will increase the contract price, a cost overage agreement must be completed before any such additional costs are incurred...