Transcript Windows Media DRM Device Porting Kit Review Scott Plette Program Manager Media Technology Group splette @ microsoft.com Microsoft Corporation.

Windows Media DRM Device Porting Kit
Review
Scott Plette
Program Manager
Media Technology Group
splette @ microsoft.com
Microsoft Corporation
Session Outline
Windows Media DRM Device Porting Kits Today
Current DRM Ecosystem and Components
Consumer Scenarios Enabled
Windows Media DRM 10 for Portable Devices
Windows Media DRM 10 for Network Devices
Play From Device Porting Kit
New consumer scenarios
Overview of design and timeline
Next steps…
Windows Media DRM Device Ecosystem
WM DRM
for Portable
Devices
Protected Content
WM Rights Manager
Format SDK
WM DRM for
Network Devices
Content Server
Windows Media DRM Platform Components
DRM for Portable Devices
For devices that are designed to store and play back
audio/video content
DRM for Network Devices
Designed for any home network device intended to
extend playback of audio/video content from a PC
Windows Media Rights Manager SDK
Allows content owners to specify Rights (usage rules)
Windows Media Format SDK
Used by media players that support WM DRM content
Windows Media DRM Consumer Scenarios
Music Purchase
Purchase a track or entire album for a fixed fee
Music Subscription
For a monthly fee, unlimited music downloads and
transfer
Movie Rental
For a fee, access a movie on a PC or device for a
limited time
Adoption of WM DRM on Devices is Growing!
Multiple portable and network devices are
available on the market today
New devices are poised to enter the market
shortly
Subscription services are coming online
There are already over 100 licensees of DRM
device porting kits
Licensee list: http://wmlicense.smdisp.net/wmdrm10/
Check out http://www.playsforsure.com for the
latest list of devices
WM DRM 10 for Portable Devices
Portable version of Windows Media DRM
for devices
Acquire and store licenses/content, access offline
Device Examples: Portable Media Device, Cell Phone,
STB, PDA, etc.
Similar features to the PC
No change to content encryption format: existing content
just works
Access content using licenses with state (Expiration, Play Count)
Supports many of the new WM DRM PC features
Secure
Keys individualized per OEM, per device
Compromised or non-compliant devices can be revoked
WM DRM for Portable Devices Requirements
Cryptography and Signing algorithms
Block Cipher – WMDRM Algorithm which includes
Data Encryption Standard (DES) with 56-bit keys in 8 byte blocks
Rivest Cipher 4 (RC4) with 64-bit keys with Byte Streams
Public Key Infrastructure (PKI) is ECC with 160/80-bit
PrivKey/PubKey
This is the private key and the Portable Device must store it securely.
Hashing algorithm is Secure Hashing Algorithm 1 (SHA-1)
Hashed Message Authentication Code (HMAC) is FIPS 198
Local Storage
Local storage required for content and DRM Data Stores
Unique serial number required (to prevent device cloning)
Expiration requires device implements real time clock
Code Size
With all optional features enabled
37KB Working Set (RAM)
190KB Code Size (ROM)
Windows Media DRM 10 – Network Devices
Portable version of Windows Media DRM for network
devices
Specification available – covers Key Exchange, Crypto,
Protocol Mappings
ANSI C Porting Kit available, includes source code, specs, tools…
Stream content from a Windows XP PC
Device Examples: Digital Media Receiver, STB, Net DVD Player,
Media Center Extender, etc.
Supported over UPnP, HTTP Protocols
Policy
Works with existing and new content
All DRM content is accessible – policy is enforced on PC
Device may only play back content, not allowed to persist content
Devices must register with the PC and establish proximity
WM DRM for Network Devices Requirements
Cryptography and Signing algorithms
Block Cipher - Advanced Encryption Standard (AES) with
128-bit keys
Public Key Infrastructure (PKI) is a 1024-bit RSA
Hashing algorithm is Secure Hashing Algorithm 1
Message Authentication Code (MAC) is SHA-1 with 1024-bit RSA
encryption and AES One-Key Cipher Block Chaining MAC 1
(OMAC1)
Local Storage
Storage must be provided for the Digital Media Receiver (DMR)
and any CA certificates in the chain
May use storage to extend network buffer during streaming and
playback
May not persist content for later playback
Disconnecting from PC stops all playback, flushes buffers.
Expanding the Ecosystem
Sharing music on portable devices is difficult
Policy prohibits content from being copied from a device
Portable devices do not interoperate with network devices
New Consumer Scenario
Users download purchase or subscription DRM content
The content is copied to a portable device that supports
WM DRM PD 10
A user wishes to play music from his portable device on a
Digital Music Receiver (DMR) at a friend’s house
The DMR enumerates all available content on the portable device
Music is “streamed” from the device over the USB connection to
the DMR where it is decrypted and played
Expanding the Ecosystem
Portable Media
Device (PMD)
PC
Copy Content
WMDRM-PD over USB
WM DRM for
Network Devices
Play From Device Porting Kit
Enable Portable Devices and Media Servers to stream
WM DRM content
Specification currently in development
ANSI C Porting Kit includes source code, specs, tools
Content to be streamed over MTP/USB or UPnP, HTTP protocols
Devices will transcript from WMDRM to AES before transmission
WM DRM ND devices will need to support MTP for USB scenario
Policy
Works with existing and new content
All DRM content is accessible – policy is enforced on device
Network device may only play back content, not allowed
to persist content
Proximity detection will be required
Overview of Design and Timeline
Play From Device PK is still in design phase
Portable and Network Devices will communicate using
the Media Transfer Protocol
Requires Network devices to implement MTP initiation when
connected via USB
Network devices will need to support USB to host connected
portable devices
Performance requirements for portable devices are a
concern
Design decisions are focusing on minimizing
performance impact
We need your feedback!
Porting Kit planned for availability in 4th quarter
of 2005
Call to Action
Help Microsoft understand your requirements for
DRM on devices
What scenarios do you wish to support?
What new devices are you planning?
When will they be available in the market?
What are their performance abilities?
How can we help support your device efforts?
What problems do you experience when porting
Microsoft technologies?
Community Resources
Windows Hardware & Driver Central (WHDC)
www.microsoft.com/whdc/default.mspx
Technical Communities
www.microsoft.com/communities/products/default.mspx
Non-Microsoft Community Sites
www.microsoft.com/communities/related/default.mspx
Microsoft Public Newsgroups
www.microsoft.com/communities/newsgroups
Technical Chats and Webcasts
www.microsoft.com/communities/chats/default.mspx
www.microsoft.com/webcasts
Microsoft Blogs
www.microsoft.com/communities/blogs
Additional Resources
Email – askdmd @ microsoft.com
Getting started with WM DRM
http://www.microsoft.com/windowsmedia/drm
Licensing DRM technologies for devices
http://www.microsoft.com/windows/windowsmedia/licensing/
drmlicensing.aspx
Current Device DRM licensees
http://wmlicense.smdisp.net/wmdrm10/
White Papers
http://www.microsoft.com/windows/windowsmedia/
knowledgecenter/technicalarticles.aspx#digitalrightsmanagement
Related Sessions
How To Design a PlaysForSure Device
Windows Media Connect and PlaysForSure for network Devices
Cellular Phone Connectivity in Longhorn
Media Transfer Protocol Implementation Details
© 2005 Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.