contractually       
adverb uk/kənˈtræk.tʃu.ə.li/ us/kənˈtræk.tʃu.ə.li/
 根据合同
according to what is written in a contract (= legal document)
  They are contractually bound/obliged to finish the work. 受合同约束他们必须完成这项工作。 
 They are not contractually required to share knowledge with local partners. 并不存在合同义务要求他们与当地合作单位分享信息。 
 See: contractual
 - More examples
 - I am contractually prohibited from speaking about the new product until next year.
 - The fighter is contractually entitled to a rematch.
 - Contractually, the parties can decide between them who pays the costs.