Apple’s popular iTunes Store has been around since 2003. It has been a premier way to purchase media. Apple protects everything it owns under various patents.
Same thing goes for iTunes.
Patently Apple has reported that Apple was granted a “major patent” for the iTunes Store that was related to its user interface for reviewing, browsing, previewing, purchasing, or distributing media items in a client-server environment.
Apple was issued a similar patent in August 2010 that involved media presentation in a client-server environment.
It seems that Apple maybe able to fight against App Stores on other platforms like Amazon’s App Store and Google’s Android Market in courts.
Source: 9TO5 Mac