But see also this (on the same page) if you're using VLC in the US:
"libdvdcss
libdvdcss is a library that can find and guess keys from a DVD in order to decrypt it.
This method is authorized by a French law decision CE 10e et 9e soussect., 16 juillet 2008, n° 301843 on interoperability.
NB: In the USA, you should check out the US Copyright Office decision that allows circumvention in some cases."
"libdvdcss
libdvdcss is a library that can find and guess keys from a DVD in order to decrypt it. This method is authorized by a French law decision CE 10e et 9e soussect., 16 juillet 2008, n° 301843 on interoperability.
NB: In the USA, you should check out the US Copyright Office decision that allows circumvention in some cases."