1. Content Protection Support in 802.11
Month Year
doc.: IEEE yy/xxxxr0
November 2007
Content Protection Support in
Date:
Authors:
Sandra Qin et al., Samsung
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
November 2007
Abstract
High definition audio and video applications are becoming popular for WLAN, and content protection requirement is ubiquitous. Due to the characteristics of the wireless media, content protection in wireless LAN requires support from the MAC and PHY layer. The requirement of content protection support and possible working areas in WLAN are presented.
Sandra Qin et al., Samsung
John Doe, Some Company

3. Motivation A/V applications are becoming popular in WLAN
November 2007
Motivation
A/V applications are becoming popular in WLAN
Mutlicasting/Broadcasting
Video conferencing
Real-time Streaming
3D gaming
Content protection requirement is ubiquitous
Content provider’s content
User generated content
Content protection support is required from MAC and PHY in WLAN
Proximity control
Packet-level link protection
Fading channel support
Roaming support
Sandra Qin et al., Samsung

4. Content Protection Requirement in WLAN
November 2007
Content Protection Requirement in WLAN
Laptop
Camcorder
Transmitting to the Internet
without permission
Copying DC PC
User Generated Data AP
Recording
Content provider’s Data
MP3 Player
DVD/BD Recorder TV
Sandra Qin et al., Samsung

5. Proximity control requirement
November 2007
Proximity control requirement
Content needs to be constrained to a certain range.
For example, within the black circle.
Sandra Qin et al., Samsung

6. Proximity control requirement
November 2007
Proximity control requirement
Content needs to be limited to a certain vicinity
Examples of requirement
Digital Transmission Content Protection (DTCP)
Round Trip Time (RTT) less than 7ms
Proximity control in WLAN
Current WLAN technology can be used to broadcast content to large vicinity
The area covered can raise concern for spreading copyright protected content
Random access delay and long connection setup prevent accurate RTT measurement
Possible new work:
Support more accurate round trip time measurement
Distance measurement based on signal strength and channel model
Other methods
Sandra Qin et al., Samsung

7. Support Packet Level Content Protection
November 2007
Support Packet Level Content Protection
Mapping existing content protection protocols to WLAN
Digital Transmission Content Protection (DTCP)
High-bandwidth Digital Content Protection (HDCP)
Stream based v.s. Packet based
WLAN needs to support packet level content protection
Copy right control bits
Cipher suite negotiation
Etc.
Work done in other TGs
TG i and TG w
Protect data packets and management frames against hackers
No copy right control, users can easily violate rules
Copy watch-only video packets
Possible new work
Mechanisms to support content protection at MAC packet level
Sandra Qin et al., Samsung

8. Content protection with fading channels
November 2007
Content protection with fading channels
Channel fading causes unreliable transmission
Bit error can cause false alert
Retransmissions causes delay
Possible new work
Robust transmission of important CP information
Error propagation prevention
Effect of delay and delay jitter on AV applications
Sandra Qin et al., Samsung

9. Roaming support for content protection
November 2007
Roaming support for content protection
Mobile devices move from one BSS to another BSS
Mobile devices move from WLAN to other networks
Possible new work
Background proximity control
CP status maintaining when roaming
Authentication handover support
Interaction with link protection from external networks
Sandra Qin et al., Samsung

10. Protocol stack November 2007 AP/Station Station Content Protection
CP support req/rsp
CP support req/rsp
CP functions: Proximity control, right control etc.
MAC/PHY
MAC/PHY
Sandra Qin et al., Samsung

11. November 2007
Summary
Content protection is becoming a crucial issue for AV applications for WLAN.
Content protection requires support from MAC and PHY layers in WLAN.
Proximity control
Packet level right control
Fading channel support
Roaming support
Lack of such support in current WLAN solutions.
Call for discussion.
Sandra Qin et al., Samsung

12. November 2007
Straw Polls
Should WNG receive further presentations on the topic of content protection support?
Sandra Qin et al., Samsung

13. References DTCP specification Vol. 1 HDCP specification Revision 1.3
November 2007
References
DTCP specification Vol. 1
HDCP specification Revision 1.3
Standard – WLANs
Standard i – WLAN MAC security enhancement
Draft s D1.05 – ESS Mesh Networking
Draft u D1.0 – Interworking with External Networks
Draft w D2.0, – Protected Management Frames
Sandra Qin et al., Samsung