A method for hiding the decryption key in a dispersive way is disclosed. A decryption key corresponding to content to be accessed is decomposed into at least two partial decryption keys, comprising first partial decryption key and second partial decryption key. The first partial decryption key is stored in a memory device. The second partial decryption key is stored in a hidden area of the memory device. When the memory device is installed on an electronic device, an application installed in the electronic device is activated. The application retrieves the first partial decryption key from the memory device and the second partial decryption key from the hidden area of the memory device, re-organizes and codes the first and second partial decryption keys to recover the decryption key, and decrypts the content using the decryption key, enabling the electronic device to access the content.