I understand what you want, and was trying to help you find a way for Encore to do it - even though it is not designed so.
solved my problem by replacing the video in the timeline which Encore considered as VTS_01_1.VOB with the one I wanted. I just hid the corresponding button and created new both the button and the timeline for the replaced video item.
Did you do this in Encore? And then again built an image? Or...
And now with the help of a program I protected the disk from copying.
What program are you using?