<https://balletalert.invisionzone.com/topic/23787-dvd-format/#comment-194378>
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"It depends on the DVD.  The majority of arts DVD's are region \"0,\" which means they can be played in all regions.  An exception was the Royal Danish Ballet's La Sylphide, which had region 1 (US) and region 2 (Europe) versions. "
<https://balletalert.invisionzone.com/topic/23787-dvd-format/>