A method for locally activating a DRM engine is disclosed. A preprocessing operation is performed, wherein rights objects are bound with digital content files with a first format. The digital content files with the first format are converted to the digital content files with a second format. The digital content files with the second format file are encrypted and a corresponding decryption key is generated. The encrypted digital content files and the decryption key are stored in a memory device. An application is designed and installed on the electronic device and the memory device is installed to the electronic device. The application is authorized according to the rights objects bound in the digital content files, decrypts the encrypted digital content files using the decryption key, wherein the digital content files with the second format can be recovered from the third format, and activates a DRM engine of the electronic device. The DRM engine binds an IMEI code of the electronic device with the digital content files, enabling the digital content files to only be accessed by the specific electronic device.