A new file system of data protection for optical disc and its data protection method were proposed. This file system was divided into plaintext section, ciphertext section and parameter section. A producer of file system was suggested to pack plaintext, ciphertext, parameter in one ISO image file. A special reader for accessing ciphertext section was injected into plaintext section. This method bound plaintext, ciphertext and the special reader together, and needn’t any extra software. This file system is compatible with all optical disc devices.