10 patents that are not used within the games along with several other improper patent pending claims. PCG claimed that "Acts of false marketing deter innovation and stifle competition in the marketplace." PCG's qui tam lawsuit was seeking up to $500 per unit sold if Activision was found liable. However, by June 2010, PCG had withdrawn the case without prejudice. Aside from being a defendant, Activision has also acted as a plaintiff. In 2007, the company issued a cease and desist letter to Nicholas Piegdon, the developer of an open source piano teaching program called Piano Hero, demanding he change the name to something less similar to that of the Guitar Hero series. He complied and renamed the software Synthesia. Oversaturation Many critics believed that the number of releases of Guitar Hero games was "milking" the brand name and oversaturating the market. PaRappa the Rapper creator Masaya Matsuura stated that the video game market was growing stale and needed to move beyond games that simply challenge the player to mimic the playing of licensed music. Ryan Geddes of IGN stated that he "hit the wall with play-along music games", and challenged the game makers to explore other ways to combine music and video games. Analysts stated that such games must continue to innovate instead of just providing more songs in order to prevent "genre fatigue". Jesse Divnich of Electronic Entertainment and Design Research commented that, much like Dance Dance Revolution, Guitar Hero and other music games explosively grew initially due to significant new features from other games but have become stagnant due to focusing on content over features, and suggested that for the genre to continue to grow, they must look to incremental changes as done with the first-person shooter genre. Former CEO for RedOctane, Kelly Sumner, believed that Activision "abused" the series, as "they tried to get too much out of the franchise too quickly". The series has also been criticized for its release model in contrast to the Rock Band series, causing some players to hold contempt towards Activision. Harmonix considered the Rock Band series as a "music platform", and supported it with downloadable content and the ability to import songs from its games and expansions into most other games of the series. Critics argued that Guitar Hero should have been doing the same, either through releasing expansions that could be incorporated into the main games of the