The Research And Development Of Mobile DRM Technology Based On Android Platform

Nowadays it is more common that using mobile devices such as mobile phones for users to download and entertainment experience in digital multimedia contents with the raising of the mobile Internet transmission speed, the popularization of3G and4G networks, and the improving abidingly property of mobile phones and PDA and other mobile terminals. Especially the emergence of multimedia social network more stimulated the access, using, sharing, and consumption of the multimedia audio and video. At the mean time, copyright protection problems such as “digital contents are easy to copy and distribute nondestructively” originally only exist high lightly in PC to gradually revealed on mobile devices also. Therefore, for digital rights management of multimedia in mobile terminals and referenced the OMA DRM2.0standard, a Digital Rights Management (DRM) approach for Android platforms was proposed in this paper.1. A DRM system based on Android platform was designed. Firstly, an improved Android platform supported DRM function for playback of multimedia contents was designed and implemented by analyzing the process of playback for multimedia contents in native Android platform. Secondly, the AES encryption algorithm was selected to package and deal with multimedia contents between3DES and AES encryption algorithms by experimental analysis. Meanwhile, the times of reading and writing were reduced in the process of encrypting and decrypting multimedia contents by the way of introducing the appropriate size of the buffer, which effectively improved the encryption and decryption speed, and shortened the response time of the system. Results of the testing showed that when the buffer size was set to102400bytes, AES encryption algorithm had higher encryption and decryption speeds, respectively was55.16MB/S and3.44MB/S.2. A cross-platform rights sharing mechanism for license was designed. Traditional DRM systems only pay attention to the copyright protection of digital content on the user’s equipment, but there is a strong demand for rights sharing between devices in the current. Based on the demand of the user’s rights sharing, a cross-platform rights sharing mechanism was designed by using the way of binding the license with the hardware information of user’s device. In the approach, the license was written by the XML language. The platform independent characteristic of XML ensures that the rights sharing operations of cross-platform to run smoothly. The final results of the prototype system testing show that not only multimedia DRM system based on Android platform achieves the expected functions, reaches the target of authorization and the usage of control for the protected multimedia contents on Android devices, but also realizes the function of cross-platform digital rights sharing.