It appear as though Activision may be in hot water because of their Guitar Hero brand, which used the likeness of Slash and his band, Velvet Revolver, despite having an agreement that they wouldn't.
Axl Rose, the frontman from Guns n' Roses is the person angry, as he feels Activision has gone against their word.
"Activision began spinning a web of lies and deception to conceal its true intentions to not only feature Slash and VR prominently in GH III but also promote the game by emphasizing and reinforcing an association between Slash and Guns N' Roses and the band's song 'Welcome to the Jungle'," the lawsuit reads.
He's asking for approximately $20 million in damages.
Source: The Hollywood Reporter