You could put a still menu on the disc with whatever text you’d like. Since there will be no button connection, the end user will never see it. Get any number of free DVD editors to view the hidden menu.
However, theres really no need to worry about piracy. Its easily defeated and unless your printing millions of copies worldwide, its not really effecting your bottom line. If thousand of people were prirating your title, youd be rich already anyway 🙂