Irdeto Access v. Echostar (Fed. Cir. 2004).
Irdeto's patent is directed to a system for controlling the broadcast of digital information signals by using three types of complementary encryption and decryption keys -- "service keys," "group keys," and "box keys." (U.S. Patent No. 4,531,020). Irdeto sued Echostar, arguing that Echostar's DISH Network infringed the patent. On summary judgment, the district court granted summary judgment to Echostar, finding that Echostar's product did not infringe. The Appeal revolved around the definition of the term "group."
Read the rest and see the graphics at http://patentlaw.typepad.com/patent/2004/09/echostar_wins_a.html
Irdeto's patent is directed to a system for controlling the broadcast of digital information signals by using three types of complementary encryption and decryption keys -- "service keys," "group keys," and "box keys." (U.S. Patent No. 4,531,020). Irdeto sued Echostar, arguing that Echostar's DISH Network infringed the patent. On summary judgment, the district court granted summary judgment to Echostar, finding that Echostar's product did not infringe. The Appeal revolved around the definition of the term "group."
Read the rest and see the graphics at http://patentlaw.typepad.com/patent/2004/09/echostar_wins_a.html