U DVD sa dajú vytvoriť akési "menu" s odkazom na kapitoly v podobe, že zadajte heslo:

Yes, what you want to do can be done, and it involves a lot of work. But, it can prevent the casual user from viewing your "work" on a standalone palyer.

For instance, let's say that you want to protect your efforts with a 4 digit decimal number password. Create 4 separate menus with a button layout that looks like a 0-9 digit keypad, and have them prompt the user to "Enter first number of password". Set the key-press actions to auto-action to next digit menu, and save the button selected in a GPRM (general purpose register - memory that the author can use). The second menu will have the same layout as the first, and the user will be prompted to "Enter second number of password". Save the button number, and repeat for the third and last number of the password.

Once the password has been entered, compare the entries to the "loaded" value. If the password is correct, then jump to the movie. If the password is NOT correct, then display a screen that says "THE PASSWORD ENTERED IS NOT CORRECT", then timeout back to the DVD's FIRST PLAY entry.
You also have to set the PROHIBITED USER OPERATIONS (P-Uop) to prevent him from just jumping to the movie.

This will prevent the average "Joe" from viewing the movie, be we all know that most average "Joes" know one guy who is a computer whiz, and this friend will either crack the password (this is the weak point of this type of "protection" - the password has to be imbedded in the program), or simply make a copy with the P-Uops removed.

The viewing of your DVD by copying it with the P-Uops removed can be somewhat prevented, with some more work from you. This requires you to scramble your chapters, so that they don't normally play in the correct order. By this, I mean take a normal 10 chapter movie, and put them on the DVD in some wierd order, like chapter 6,3,10,9,1,4,8,2,7,5. You can either encode them this way, or use some type of PLAYLIST option.

If your password is entered correctly, you would jump to the correct chapter 1. At the end of EVERY CHAPTER, you would have to have a command sequence that would check to see if the password is correct, then jump to the appropriate chapter. If it is incorrect, then just continue with the next sequential chapter (ie, continue to chapter 3 from chapter 6).

So, to really be able to view your DVD, someone would have to pour through the menu programming and snatch out your password (although with creative programming, it can be made somewhat difficult - not something that the casual cracker could do).

So, I guess that the short answer is "Yes", it can be done. But is it worth the effort? My guess would be "No".