According to statements given to The Hollywood Reporter, EMI demanded royalties from the game makers but never received a response. EMI is looking for compensation on 54 songs from Def Jam Rapstar's total tracklist, and with EMI looking for upwards of $150,000 for each "infringement" that total tab is looking mighty steep. In the worst case, that brings us to total of $8.1 million.
The karaoke aspect of Def Jam Rapstar, and its online video-sharing capabilities, also make this dispute trickier, since EMI owns the rights to display, publicly perform and distribute these songs. Please excuse us while we try to get Richard a good lawyer in case EMI targets us next.