1. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 1 Content Protection Support in 802.11 Date: 2007-11-12 Authors:

2. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 2 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.

3. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 3 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

4. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 4 Content Protection Requirement in WLAN MP3 Player Camcorder DC AP Laptop PC TV User Generated Data Content provider’s Data DVD/BD Recorder Recording Transmitting to the Internet without permission Copying

5. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 5 Proximity control requirement Content needs to be constrained to a certain range. For example, within the black circle.

6. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 6 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

7. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 7 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

8. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 8 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

9. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 9 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

10. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 10 Protocol stack Content Protection MAC/PHY Content Protection MAC/PHY CP support req/rsp CP functions: Proximity control, right control etc. StationAP/Station CP support req/rsp

11. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 11 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.

12. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 12 Straw Polls Should 802.11 WNG receive further presentations on the topic of content protection support?

13. doc.: IEEE 802.11-07/2778r1 Submission November 2007 Sandra Qin et al., SamsungSlide 13 References DTCP specification Vol. 1 HDCP specification Revision 1.3 Standard 802.11-2007 – WLANs Standard 802.11i -2004 – WLAN MAC security enhancement Draft 802.11s D1.05 – ESS Mesh Networking Draft 802.11u D1.0 – Interworking with External Networks Draft 802.11w D2.0, – Protected Management Frames