I want to know the answer to the following question:
What was the vertical blanking interval used for in LaserDiscs, preventing Macrovision signal to be implemented?
All the background I'm provided with is that "The vertical blanking interval, where the Macrovision signal would be implemented, was also used for the internal timing on LaserDisc players, so test discs with Macrovision would not play at all.". Is that enough to answer the question?
Answer: yes