The DVD region coding has absolutely nothing to do with encryption.
It's just a random bit field that decoders happen to pay attention to.
What you're referring to is the Content Scrambling System, which is a
protocol that negotiates a session key between the reader and the
decoder, via the host CPU, using a proprietary hash algorithm. If CSS
is enabled on a title (a subset of a disc), the reader will refuse to
read that title until the CSS negotiation has been successfully
Officially, you have to pay 5 kilobucks to Matsushita and sign a bunch
of NDAs to get the CSS spec. It's almost certainly possible to
reverse-engineer it from a software decoder implementation (such as
the one that ships with some Compaq desktops), but I have yet to see
anyone publish the results of such an effort.
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