Validity management system for digital file and method for operating the same

A validity management system for a digital file and a method for operating the same are provided. The system includes a file server that links with a file storage system and a blockchain for providing services of saving file, verification and setting time validity. When an original file is received, an identification data is created and a hash value is calculated. The original file is uploaded to the file storage system that provides an original file address. The hash value, the identification data and the original file address are transmitted to the blockchain for creating a record. When any user requests for retrieving the original file, the original file is retrieved from the file storage system. The original file can be verified according to the record obtained from the blockchain. Afterwards, the user can create a copied file and decide accessibility of the copied file by setting time validity.