Def Jam Rapstar was essentially a game in the same vain as other music games, that required players to rap the correct lyrics in time with the music to earn points. It faced a mixed reception on release, but still sold a reasonable number of copies. The main problem came from the fact that the developer 4mm Games, and distributor Terminal Reality, had apparently not secured the correct rights to use all of the music in the title. This led to both companies being sued by EMI for more than $8 million, and a portion of the profits to act as payment for copyright infringement and royalties. Later, the City National Bank also sued the publisher Konami for $8.9 million in damages, for alleged fraud that was carried out to secure funds to produce and distribute Def Jam Rapstar.