I prefer not to go by documents not from the AACS people themselves - especially when said document is over a year old and came out before HD DVDs were ever made.
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Matt,
You can probably find good information here:
http://securityevaluators.com/eval/spdc_aacs_2005.pdf
As far as I know, the sequence keys have no other purpose than traitor tracing.
I believe that the volume keys won't be enough once the sequence keys are in use.
I prefer not to go by documents not from the AACS people themselves - especially when said document is over a year old and came out before HD DVDs were ever made.