contractual license meaning in English

契约性许可证

If it is difficult to determine the losses which the patentee has suffered or the profits which the infringer has earned , the amount may be assessed by reference to the appropriate multiple of the amount of the exploitation fee of that patent under contractual license
第六十一条专利权人或者利害关系人有证据证明他人正在实施或者即将实施侵犯其专利权的行为，如不及时制止将会使其合法权益受到难以弥补的损害的，可以在起诉前向人民法院申请采取责令停止有关行为和财产保全的措施。