CSS and Macrovision are both typically used on Hollywood dvd's to prevent copying. CSS is used to prevent direct digital copying of the disc to optical (DVD recordable) media. Macrovision is used to prevent DVD to VHS copying. Both are relatively easily defeated by software, but I do agree with frawley for the most part it takes a fair amount of knowledge to do this. Because of that, casual copying is reasonably deterred with these protection schemes. With that all said, recent programs (DVDXCopy for one) have been released that allow for direct disc copying. One other deterrent that Hollywood uses is creating content with file sizes that exceed a recordable dvd (dual layer discs are becoming the norm).

If you are creating discs (like Hollywood) that will have mass appeal, then the cost of copy protection schemes is worth it. It won't stop everyone, but a majority. If one is creating discs for a smaller audience (events, weddings, and the like), then the cost isn't (IMO) worth it. You make your money on creating the content the first time with a high profit per disc ratio. I generally throw in an extra copy for the the customer anyway because dvd recordable media is much more susceptible to scratches and smudges causing playback failure. Hollywood makes less profit per disc, but hopes to make up for it in volume. Not much mass appeal outside the bride and groom's own personal interest in their wedding dvd(perhaps the immediate family and wedding party).

Jim