Abstract: Provided is a digital information storage system, a digital information security system, and a digital information storing method, and a digital information providing method, and more particularly, to a digital information storage system including: a shared storage containing unique hardware information; and one or more user terminals interoperating with the shared storage through a network, encrypting digital information by using the hardware information of the shared storage and storing the encrypted digital information in the shared storage, and decoding the encrypted digital information by using the hardware information while loading the stored digital information. Accordingly, digital information is encrypted by using hardware information of a shared storage. The digital information can be thus protected from leakage caused by an illegal copy or the like.