NTSC versus PAL
I want to use a Mac to burn DVDs that would work in either Europe or the US. I've already established that iDVD/iMovie does not put any geographic zone encoding (US is zone1, Europe is 2). But now I am worried about NTSC (the US TV format) versus PAL (the European TV format). Does a DVD follow the TV format of a given country? In other words, does a DVD in the US follow NTSC, rendering it unusable in Europe, or there is no such thing?