Study And Implementation Of Digital Rights Management On The Android Mobile Terminal

In the past few years, Android mobile terminal (Smartphone and tablet computer) has attracted more and more people because of its good performance. Meanwhile, with the rapid development of the third generation mobile communication technology, the network transmission rate on the mobile terminal has a great improvement. The digital content, which only can be transmitted among the computers before, has been widely circulated on the mobile terminals. More and more people consume digital content on the mobile terminals. So it’s necessary to pay more attention to the security of digital content on the mobile terminals. Digital right management (DRM) has becoming a pressing concern for the digital content business.DRM is developed to protect the copyright of the digital content, which integrates encryption, decryption and signature. Nowadays, there are several DRM standards all over the world. The OMA DRM is the most popular DRM standard in mobile communication which is established by Open Mobile Alliance (OMA).The OMA DRM is the most perfect so far with the largest number of members.However, there are also several problems in the application of OMA DRM on the mobile terminal Firstly, to ensure the security of the whole DRM system; the OMA DRM needs a more complex production environment, for example, the build of the Certificate Authentication (CA), the management of the certificates. So it is rarely used in China. Secondly, because of the rapid update of the mobile terminal and the increased competition, the price of the mobile terminal has declined sharply. More and more people change their terminals even the current terminal was bought a few months ago. New problem appears, how can one who consumes digital content on an old terminal access his digital content on the new mobile terminal. Finally, as is known to all, the multimedia content may have a large size. However, due to the limit of the poor computation capability and battery power of the mobile terminals, it may be undesirable to encrypt a whole large multimedia content which may be more than10M bytes.In this paper, we put forward a DRM system model based on OMA2.1, which can effectively solve the above problems. In this model, from the delivery of certificate to the business and the display of digital content,we all make a detailed description.