Standardization of OMA DRM -Technologies for Handling Digital Content Distribution and Copyright Management-
نویسندگان
چکیده
Unlike tangible goods such as industrial products and food products, digital content distinguish themselves by the fact that it is very easy to duplicate products of the same quality. The copyright law prohibits duplication of content without the permission of the creators can be obtained, but in reality, there are many cases where content are duplicated and used illegally. Properly protecting the copyright of content is extremely important for content creators and it’s demand is strong as well. Considering these facts, the concept of Digital Rights Management (DRM), i.e., digital content copyright management technologies, has been attracting attention recently. At first, the focus of attention was on DRM technologies applied to music CDs, DVD movies, digital broadcast and similar media, but application of the DRM technology to mobile terminals is coming into the spotlight lately as well, as content provided to mobile terminals are becoming diversified and increasingly expensive. From the background above, the Open Mobile Alliance (OMA), a standardization organization dealing with mobile application technologies, standardized the OMA DRM specification for mobile terminals. OMA DRM is intended to protect any content delivered to mobile terminals; it can prevent illegal copy of digital content and allows defining restrictions related to content usage (e.g., number of usages and expiration date). Moreover, OMA DRM has various functions requested by content providers; it also has the super-distribution function for promoting content distributions that separate content and right information. There are two versions of OMA DRM: the simple OMA DRM version 1.0 (DRMv1.0), which is mainly targeted at inexpensive content, and the more sophisticated OMA DRM version 2.0 (DRMv2.0), which is mainly targeted at expensive content. This article describes the standardization of OMA DRM and provides a technical overview of each version.
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