Principal was her own manager in contract negotiations with CBS and Lorimar Productions, which produced "Dallas". When Principal signed her "Dallas" contract, she omitted the clause that would have given the network the right to consent and profit from her outside endeavors. She explained, "As a result that's why, you can only notice in hindsight, I was the only person in the cast who did commercials, who was doing movies of the week, who wrote books and these all belong to me. I retained the control and ownership of my image. No one owns me."