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OMA DRMWeb Computing LaboratoryGraduate Institute of Applied
Science and Engineering, Fu Jen Catholic University
March 15, 2008Kevin LiuAdvisor Prof. Hsing Mei
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*OutlineIntroductionDRM System OverviewThree DRM V1.0
methodsCombined deliveryForward-LockSeparate deliveryIntroduction
of DRM V2.0DRM WebsiteConclusionReference
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OMA DRMOMAOpen Mobile Alliance20026Open Mobile Architecture
Initiative SupportersWAP ForumOMA.
DRMDigital Rights ManagementIs the means to control the usage of
the media object once it has been downloaded.
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PrefaceWithout protection and management of digital
rights,Digital content can be easily copied, altered, and
distributed to a large number of recipients, which could cause
revenue loss to media companies.
There is a need for content providers and operators to control
the usage of downloaded media objects.
To protect commercial digital intellectual property and avoid
digital piracy,we need a system that prevents unauthorized access
to digital content and manages content usage right.
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Introduction of DRMA content provider can grant a user the
rights to preview media objects for free and charge the user only
for the full usage rights.
The value lies in the rights and not in the media object
itself
DRM makes it possible to sell the rights to use the media
object, rather than selling the media object itself.
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Introduction of DRMA DRM system should offer a persistent
content protect against unauthorized access to the digital content
,limiting access to only those with the proper authorization.
DRM enables content providers to define rules (rights) for how
the media object should be used.the ability to preview DRM
contentto prevent downloaded DRM content from being illegally
forwarded (copied) to other users
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IntroductionThe rights can be delivered to the consuming device
by downloading them together with the content or by sending the
rights object separately from content.
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DRM System Overview
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Three DRM V1.0 MethodsForward-Lock
Combined delivery
Separate delivery
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Forward-lock (FL)A special case of combined delivery method
where the DRM message does not contain a rights object.
The device is allowed to render the content but not to forward
it to other devices.
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Forward-lock (FL)The Content Provider, using a DRM Packager,
packages the media object into one DRM Message and makes the URL
available to the device (e.g. by publishing it on a Web page).
HTTP Download is used to deliver the DRM Message.
The User is using the media object.
The DRM agent ensures that the media object is not copied to
another device, via IrDA or Bluetooth, or sent from the device in
an MMS or email.
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Combined delivery (CD)Delivery of the rights object and content
together in a single message.
The DRM message includes the media object and a rights
object.
The device may render the content according to the rights
object.
If the device supports the combined delivery method it MUST also
support the forward-lock method.
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Combined delivery (CD)The Content Provider, using a DRM
Packager, packages the media object and the rights object into one
DRM Message.
The DRM Message is made available to the device (e.g. by
publishing it on a Web page).
To download the DRM Message (media object + rights object).
The User is using the media object. The DRM agent ensures that
the media object is used according to the rights.
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Separate delivery (SD)Delivery of the rights object and content
via separate transports.
If the device supports the separate delivery method it MUST also
support the combined delivery and forward-lock methods.
If there are no rights objects associated with a piece of DRM
content the device MUST NOT consume the content.
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Separate deliveryIn the separate delivery method the content
provider needs to convert the plaintext media object into DRM
content format (DCF).
This conversion includes symmetric encryption of the content
making the DRM protected content object useless to parties not
having access to the Content Encryption Key (CEK).
The content in DRM format may be distributed via an insecure
transport whereas a more secure transport (from DRM point of view)
is used to deliver the rights object with the CEK.
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Separate deliveryIn the separate delivery method the media
object is always encrypted and converted into the DCF format.
When a media object is distributed in encrypted form, the key is
with the rights object.
The device should allow to forward the DCF file to another
device.
The device must not forward rights objects from the device.
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Separate deliveryThe media object is allowed to pass from mobile
device to mobile device through any channel, with the rights object
being obtainable from the Rights Issuer.
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DRM V1.0 Use Case
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Introduction of DRM V2.0(public key) (trust element)
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The Trust Element of DRM V2.0DRM Agent
Content Issuer
Rights Issuer
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DRM Agent(trusted entity)DRM DRM
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Content IssuerDRM OMA DRM DRM DRM AgentContent Issuer DRM
AgentDRM
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Rights IssuerDRM Rights ObjectsXML DRM DRM
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DRM Website
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DRM Website
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ConclusionDRM DRM
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ReferenceOMA Digital Rights Management V1.0 Approved Enabler
Digital Rights Management
(OMA-Download-DRM-V1_0-20040615-A.pdf)
Download Architecture(OMA-Download-ARCH-V1_0-20040625-A.pdf)
Introduction to DRM - Digital Right Management
DRM Website
DRM
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Q & A