HD DVD format will have region coding similar to that of its predecessor. Called Region Protection Coding, the new specification will function in much the same way as current DVDs do: restricting players from showing content from discs purchased outside of the player's region. The number of regions and the geographies they each will cover are not yet known.
If RPC is ultimately approved and incorporated into the HD DVD format, it is unclear how the players that have already been sold will handle it. The most logical solution would be to allow the current handful of HD DVD players already on the market to play any HD DVD.
More...Credit:ars technica
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