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Presented by: Dmitry Mogilevsky DRM Group: Archana Dutta, Haoweng Huang, Dmitry Mogilevsky, Kasem Kharbat University of Illinois Spring 2006. 563.12.4 Overview of IPMP Extensions in MPEG-4 Architecture. Motivation. DRM development has occurred on many simultaneous fronts

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563 12 4 overview of ipmp extensions in mpeg 4 architecture

Presented by: Dmitry Mogilevsky

DRM Group: Archana Dutta, Haoweng Huang, Dmitry Mogilevsky, Kasem Kharbat

University of Illinois

Spring 2006

563.12.4 Overview of IPMP Extensions in MPEG-4 Architecture.
motivation
Motivation

DRM development has occurred on many simultaneous fronts

One of the results is lack of interoperability between content, players and different DRM systems.

IPMP-X: Specific DRM solution by the MPEG-4 group which focuses on interoperability

Ability to play different vendor's content on the same player

Ability to use different IPMP systems on the same player.

motivation 2
Motivation(2)

Design must address the Gobi Desert Scenario

In the middle of the Gobi Desert, Mr. MPEG should be able to transfer content from his Panasonic player to his wife's Philips player

IPMP Extension should support such request, even if the song is protected by tools that are not present on his wife's player.

motivation 3
Motivation(3)

Gobi scenario imposes the following requirements

A way to signal to the terminal which IPMP Tools are needed to consume the content

Ability to retrieve the missing tools from a remote location

Secure way to transfer content and tools from one player to another.

Tools from different manufacturers should be able to securely communicate with each other

And others...

architecture
Architecture

Five elements:

IPMP Tools

IPMP Descriptors

IPMP Elementary Streams(ES)

IPMP Tool List

Secure Messaging Framework

More generalizable interface, compared to the IPMP original “Hooks” design

architecture ipmp tools
Architecture – IPMP Tools

IPMP Tools

Modules that perform one or more IPMP (DRM) functions

Authentication

Decryption

Watermarking

Rights

Etc..

IPMP Tools are not standardized in MPEG-4

Its not possible to standardize every possible IPMP function

Thus IPMP Tools are left to be defined by 3rd Party Vendors

architecture ipmp descriptors and elementary streams
Architecture – IPMP Descriptors and Elementary Streams

IPMP Descriptors

Part of MPEG-4 Object Descriptors (OD)

Describe how an object is accessed and decoded

Identify which IPMP Tools are used to protect the object

IPMP Elementary Streams (ES)

Carries IPMP specific data

Key Data

Rights

Syntax and semantics of IPMP ES are further specified in IPMP Extension

architecture ipmp tool list
Architecture – IPMP Tool List

IPMP Tool List

Specifies which tools are needed by the terminal to consume the content

Enables the terminal to manage and retrieve missing tools.

Carried in the Initial Object Descriptor (IOD) of the MPEG-4 stream

architecture secure messaging framework
Architecture – Secure Messaging Framework

Defines an interface by which tools communicate with Tool Manager and with each other

Messaging communication was chosen over functional interfaces

Messaging is handled by a conceptual entity called Message Router.

Message syntax and semantics are clearly defined to facilitate inter-tool interoperability

Messaging approach is more secure, easily maintainable and interoperable than functional interfaces

flexible protection signalling tool management
Flexible Protection Signalling – Tool Management

IPMP Tool Elementary Stream Descriptor

IPMP-X allows Tools to be carried as part of MPEG-4 stream

Defines a new ES of type “IPMPToolStream” to do so.

This stream is referenced in the IOD to allow retrieval

Decoding of this stream is done by the Tool Manager itself

flexible protection signalling
Flexible Protection Signalling

IPMP Descriptor and IPMP DescriptorPointer

Carries IPMP information to one or more tools

keys, usage rights, mutual authentication, etc...

Information about which control point the tool operates on

Information about resolving contention among different tools on the same control point

Location determines whether tool operates on the entire MPEG-4 object, or an individual stream

secure messaging framework
Secure Messaging Framework

MPEG-4 Group defines the following components of the IPMP Tool Interaction Framework

Interaction between Terminal and Tools

Messages (syntax and semantics)

Message routing

Allows different IPMP Tools, from different vendors to be plugged into the terminal and interoperate with each other and the terminal securely

examples protecting mpeg 4 content with ipmp x
Examples – Protecting MPEG-4 Content with IPMP-X

Content: MPEG-4 Stream

Single Audio Stream

Video object with two streams

Basic Layer

Enhancement Layer

Protection

Basic Layer unprotected

Enhancement Layer encrypted with AES

Copyright information watermark in audio stream

examples protecting mpeg 4 content with ipmp x16
Examples – Protecting MPEG-4 Content with IPMP-X
  • Tools
    • Tool X can do AES decryption
    • Tool Y can do Watermark Detection
  • IPMP Tool List is constructed for these two tools and placed in IOD
    • Can also include tool elementary streams for easy retrieval
gobi desert scenario
Gobi Desert Scenario

Bob wants to listen to content for IPMP-A

Bob connects his device to Alice's

Locates the content using inter-device messages, and requests a download

The two devices mutually authenticate using IPMP-X interdevice messges and establish a secure channel

Content is security downloaded using the secure channel

Bob's device checks the tool list of the content and determines IPMP-A is not on the device, nor is it in the IPMP Tool ES in the content stream

gobi desert scenario19
Gobi Desert Scenario

Bob's device connects to Alice's and requests the missing IPMP-A tool.

Devices mutually authenticate

IPMP-A is transferred to Bob's device, using IPMP-X inter-device tool transfer messages.

Bob can now play the content locally using IPMP-A tool.

This requires previously established trust (which is the focus of our project)

questions
Questions?
  • Ming Ji, SM Shen, “MPEG-4 IPMP Extension for Interoperable Protection of Multimedia Content”. EURASIP Journal of Advanced Signal Processing. http://www.cs.missouri.edu/~zeng/MPEG-4_IPMP_final_manuscript.pdf
  • Rob Koenen, “Overview of the MPEG-4 Standard”, http://www.chiariglione.org/mpeg/standards/mpeg-4/mpeg-4.htm