The Null Device
Blogger and former teenage role-player Rory weighs in on copy-protected pseudo-CDs comparing them to an anti-photocopying trick used by a RPG company in the 1980s:
But publishers in the early '80s saw the advent of cheap plain-paper photocopying as the End Times, and some of them took measures to prevent it. The most memorable was the Tangerine Game. It wasn't actually called the Tangerine Game; this was a game with a manual printed on tangerine-coloured paper. Which photocopies as a sheet of solid black. This masterstroke was, unfortunately, self-defeating. Tangerine paper is incredibly hard to read, and rules that can't be photocopied are hard to share with friendsthe same friends you want to play the game with. So we never bought or played the Tangerine Game, and now I can't even remember its name.