You're probably thinking about the agreement MS had with PC manufacturers that required them to pay for a copy of DOS regardless of whether the computer they so

You're probably thinking about the agreement MS had with PC manufacturers that required them to pay for a copy of DOS regardless of whether the computer they sold had a copy of DOS or not. MS was barred from using that method in 1994. https://www.justice.gov/atr/competitive-impact-statement-us-v-microsoft-corporation https://www.justice.gov/atr/competitive-impact-statement-us-...