Depends on how far you want to go. I'm sure there is some way to prevent casual copying, but if the movie industy can't come up with a fool-proof copy-protection system then I'm guessing your options are limited.
I tried to find some Info and Google, only found one bit of information. I guess the deal with copy-protected DVD's is that they have 2064 bytes per sector. (Mode 7) Our DVD burners can only do 2048 bytes per sector, the other 16 bytes is already handled for us. Not to mention the special CSS info.
If you're trying to do this as a casual user you may be out of luck. Any way I can find requires some money to get a master disc created.