Thanks STL and Foxbat. I hope satisfaction and deeper understanding are their own reward. The reason I made up this quiz was because the last time I googled it, I saw about 10-1 in favor of progressive. This surprised me since I thought it was interlaced. Clearly Foxbat is more skilled with Google than I am (or was). But my theoretical understanding of DVDs was better.I thought DVDs were a progressive recording, and they need to be interlaced for SD TVs. A little web research shows that you do indeed win, as everything I can find indicates DVD Video is interlaced (progressive source material flags the decoder for different handling for movies).