Research And Application Of Mobile DRM System Based On Mega-SIM Card

Development of internet made digital world become more and more important in the whole society. On one hand, the advancement of technology greatly promotes the development of digital content industry. On the other hand, the copyright of these digital contents is threatened seriously for the digital contents can be copied, modified or spread easily without permission. With the development of mobile communication technology and the popularization of the smart phone, the same problem appears in this field. Measures must be taken to protect the copyright of these digital content.Digital Right Management (Abbreviation is DRM) is developed to protect the copyright of the digital content, which integrates encryption, signature, watermark and so on. The Goal of DRM is to make the illegal access to the digital content impossible or increase the costs to do this. OMA DRM is the most popular DRM standard in mobile communication which is established by OMA. And the OMA DRM is the most perfect one so far with the largest number of members.This thesis studied the OMA DRM, and put forward a model of OMA DRM based on Mega-SIM card and smart phone. With the advantage of Mega-SIM, the system set up a file database for DRM management in the SIM card in order to store the right objects corresponding to the digital contents received by the mobile terminal. At the same time, the system set up a special channel by expanding two commands of ISO7816. Nonstandard files in the SIM card can be read by the mobile terminal through this channel. And right objects stored in the SIM card can be passed between the terminal and the card.The advantage of the system described in this thesis is that the digital content and its right object are stored separately. The digital content is stored in the mobile terminal and can be shared by different users by USB, blue-tooth and so on without additional payment. The right object is stored in the SIM card and can not be shared for the files in SIM are not visible. Because the SIM card can identify the users uniquely, this system is able to protect the content suppliers' interests as well as the right of users' consumption.