>> Not sure I understand what this means: >> >> "The spec also includes content protection using a broadcast >> encryption scheme and a method for exchanging keys in >> over-the-air broadcasts or via an Internet back channel." > > Mark A. Aitken wrote: > > OMA Bcast DRM profile for one-way (broadcast) applications... Right, but somewhere along the line there's a two-way protocol to register the mobile device. Maybe I'm not using the correct term for this. The way I read it, in the broadcast OMA standard, there's a two-way protocol called the Online Certificate Status Protocol. It validates the PKI certificate of the mobile device. A broadcaster would presumably require this registration before the mobile device can decypt any individual protected content. And the broadcaster can also exclude, during the OCSP exchange, any device it knows to have been hacked. Seems to me that a two-way link will be required at some point, even if it is not during the entire session. Bert ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.