From what I am told, you would run into legal trouble if you were to go into the Nero program to figure things out. However, any content you create in Nero is yours. I would encourage your efforts to edit a Nero compilation file. I have often seen a need for this.
One such example is when you create a slideshow in Nero Vision and you remove a picture the compilation calls for, it will replace it with a black picture. However, there is no way to remove this black picture.