In its April 17 filing, Burst alleges that its technology has been essential to Apple’s success, providing it with a critical audio and video-on-demand media delivery solution. "We have a responsibility to protect our patents and to seek a fair return for the many years and tremendous investment that we have made in developing Burst technology and patents," said Burst.com's Chairman & CEO Richard Lang. Burst alleges that Apple’s iTunes Music Store, iTunes software, the iPod devices, and Apple’s QuickTime Streaming products infringe Burst’s U.S. Patents 4,963,995; 5,995,705; 5,057,932 and 5,164,839. Burst.com is represented by San Francisco law firm Hosie McArthur, who also represented Burst in its successful litigation against Microsoft. In March 2005, Microsoft settled that litigation by paying Burst $60 million for a non-exclusive license to Burst’s patents. Burst has also expanded its legal team in the Apple litigation to include attorneys from the Seattle office of Susman Godfrey, LLP, as well as Houston-based intellectual property firm Heim, Payne & Chorush, LLP. Also representing Burst is Palo Alto-based intellectual property firm Carr & Ferrell, LLP.