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A Method of MMS Super Distribution Disclosure Number: IPCOM000021453D
Original Publication Date: 2004-Jan-20
Included in the Prior Art Database: 2004-Jan-20
Document File: 3 page(s) / 163K

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This discloses a method to enable flexible super distribution in MMS. Conventional superdistribution in DRM systems requires the receiver to contact the rights issuer to obtain the rights object, and this may lead privacy problem and potential risk (e.g. the rights issuer may be unreachable in some cases). Our invention adds a counter in the rights object, so that the users can distribute the contents freely without violate the copyright.

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A Method of MMS Super Distribution

1. Background: What is the problem solved by your invention? Describe known solutions to this problem (if any). What are the drawbacks of such known solutions, or why is an additional solution required? Cite any relevant technical documents or references.

Multimedia messaging service (MMS) is a new global messaging standard that enables a wide range of different media elements, including text, color pictures, animations, audio samples, and video clips. MMS promises a dramatic increase in messaging capabilities that will enrich user experience and create a major new source of revenue for network operators as well as content and service providers.

Because MMS support multimedia applications, one important issue should be resolved. That is digital rights protection. Therefore Digital Rights Management (DRM) is defined in OMA standard to deal with this problem for MMS services. The scope of OMA DRM is to enable the controlled consumption of digital media objects by allowing content providers the ability, for example, to manage previews of protected content, to prevent downloaded protected content from being illegally forwarded (copied) to other users, to enable super distribution of protected content, and to enable transfer of content between DRM agents. The OMA DRM architecture is shown in Figure 1.

DRM System

Network Store

Removable Media

Content Issuer

Protected Content



Rights Object

Content/Service Provider


Usage Rules


Content Protected


Figure 1: Functional architecture

Before content is delivered, it is packaged to protect it from unauthorized access. A content issuer delivers protected content, and a rights issuer generates a rights object. The content issuer and rights issuer embody roles in the system. Depending on deployment they may be provided by the same or different actors, and implemented by the same or different network nodes. For example, in one deployment, content owners may pre-package protected content, which is then distributed by a content distributor acting as both content issuer and rights issuer.

A rights object governs how protected content may be used. It is an XML based document specifying permissions and constraints associated with a piece of protected content. Protected content cannot be used without an associated rights object, and may only be used according to the

DRM Agent

Other DRM Agents


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permissions and constraints specified in a rights object.

OMA DRM makes a logical separation of protected content from rights objects. Protected content and rights objects may be requested separately or together, and they may be delivered separately or at the same time. For example, a user can select a piece of content, pay for it, and receive protected content and a rights object in the same transaction. Later, if the rights object expires, the user can go back and acquire a...