I've seen plenty of pirate films of very poor quality that would disagree with this.........I've ruined many a good film cos I was too eager to see it, watched a dodgy copy and totally ruined it for myself
I think what Chris means if you are coping a dvd from an original to another dvd, or a game for example (game consoles). Most pirate films are filmed by some numpty in a cinema with someone's head bobbing up and down infront of the camera then copied onto a dvd in a compressed format which will be of a much lower quality.