One thing that sticks out to me on the subject of copier wars was the copy protection measures that were implemented on small booklet walk-throughs for adventur

One thing that sticks out to me on the subject of copier wars was the copy protection measures that were implemented on small booklet walk-throughs for adventure games. Usually there were red marks over the text that I presumed prevent photo-copying, and a red film you would look through to read the booklet. At some point there was no use as these things would be posted on BBS sites and you could simply print them out.