In general, there is no way to prevent anything from being copied, if those wanting to copy it are determined enough. If something can be seen or heard, it can be copied. The best you can do is 1) try to make it difficult enough so that it's not worth people's effort to copy it, then 2) make it cheap enough so that there is no incentive to copy it. DVD Architect cannot help you with #1; you need very specialized and expensive software and licensing for this. #2 is entirely up to you and your market.