Monopoly

In 1941 the British Secret Service had John Waddington Ltd., the licensed manufacturer of the game outside the U.S., create a special edition for World War II prisoners of war held by the Nazis. Hidden inside these games were maps, compasses, real money, and other objects useful for escaping. They were distributed to prisoners by secret service created fake charity groups. This was the first "special issue" of the game.
By the 1970s, the game's early history had been lost (at least one historian has argued that it was purposely suppressed), and the idea that it had been created solely by Charles Darrow had become popular folklore. This was stated in the 1974 book The Monopoly Book: Strategy and Tactics of the World's Most Popular Game, by Maxine Brady, and even in the instructions of the game itself. As Professor Ralph Anspach fought Parker Brothers and its then parent company, General Mills, over the trademarks of the Monopoly board game, much of the early history of the game was "rediscovered".
Because of the lengthy court process, and appeals, the legal status of Parker Brothers' trademarks on the game was not settled until the late 1970s. Anspach won the case on appeals in 1979, as the 9th District Court determined that the trademark "Monopoly" was generic, and therefore unenforceable. However, on Hasbro's pressure, the US Congress immediately passed a statute amending the Trademark Act to protect longstanding marks against 'generic' claims. Thus the game's name remains a registered trademark of Parker Brothers, as do its specific design elements. Parker Brothers' current corporate parent, Hasbro, again acknowledges only the role of Charles Darrow in the creation of the game. Anspach published a book about his research, called The Billion Dollar Monopoly Swindle (and republished as Monopolygate), in which he makes his case about the purposeful suppression of the game's early history and development.