Have legal effect. A fax or photocopy contract belongs to a written contract in form. As long as the contents of the contract do not violate the relevant provisions of the Civil Code on invalid contracts or revocable contracts, fax contracts have legal effect. Article 469 of the Civil Code, the parties may conclude a contract in written form, orally or in other forms. Written form refers to contracts, letters, telegrams, telexes, faxes and other forms that can tangibly express the contents contained. A data message that can tangibly express its content through electronic data interchange, e-mail, etc. , and can be retrieved at any time, are considered in writing.