Not sure about the 80s, but off the top of my head, there is clear evidence in the early 90s with lawsuits against both Galoob (game genie) and Atari (Tengen ga

Not sure about the 80s, but off the top of my head, there is clear evidence in the early 90s with lawsuits against both Galoob (game genie) and Atari (Tengen games without the 10NES chip).