To apply CSS in encore 1.5 just choose the disc tab and project settings and turn on css encryption and macrovision at the bottom of the window.

I guess it might be something similar in ver 2.0.

But if it doesn't work for the big studios it won't work for you, so why bother. :

If you are going to sell your DVD's try and pre-sell as many as possible and deliver all at the same time, so there are no DVD's out there to copy until everyone has it.

Good Luck