Structure and method for digital data memory card encryption

A method for digital data memory card encryption, wherein a memory is provided in a memory card. The memory itself is provided with a read controller that cooperates with a reader, and a protection area, and is further divided into a hard disk partition table area and a file area. A portable storage identification (PSID) is written into any of the above-mentioned areas by using an application programming interface (API). When the file area in the memory card has recorded a right object, and other readers want to read the memory card, the portable storage identification (PSID) can be used as an encryption mechanism for identification and reading, so as to increase the security in the digital rights management (DRM) of the digital data on the memory card. Moreover, before the writing of the portable storage identification (PSID) by the application programming interface (API), a key instruction produced by means of an encryption and decryption logic is provided to the read controller by the application programming interface (API). The read controller first decrypts the key instruction, and transmits the result to the application programming interface (API).