I think Jacobsen vs Katzer [0] is the most relevant one to the discussion here, but there a number of successful cases on this front. If memory serves, BusyBox

I think Jacobsen vs Katzer [0] is the most relevant one to the discussion here, but there a number of successful cases on this front. If memory serves, BusyBox has also managed to enforce GPL in court on a number of occasions. [0] https://jolt.law.harvard.edu/digest/jacobsen-v-katzer https://jolt.law.harvard.edu/digest/jacobsen-v-katzer