5. Where, notwithstanding paragraphs 2, 3 and 4, parties agree, as between themselves, to the use of certain types of electronic signatures or certificates, that agreement shall be recognized as sufficient for the purposes of cross-border recognition, unless that agreement would not be valid or effective under applicable law.
5. 当事各方之间约定使用某些类别的电子签字或证书的，即使有第2款、第3款和第4款的规定，仍应承认该协议足以成为跨国境承认的依据，除非根据适用法律该协议无效或不产生效力。