As an aside to this, are there any documentaries or clips or things to read about "retro" console piracy that necessitated something like the lockout chip? I m

As an aside to this, are there any documentaries or clips or things to read about "retro" console piracy that necessitated something like the lockout chip? I mean at this point I know about flashcarts but I dont know a thing about back when the NES wouldve been new-ish, let alone before then.