On August 17, 2012, BriarTek IP filed a complaint with the U.S. International Trade Commission that alleges that Delorme's and Yellowbrick's 2-way Satellite Emergency Notification Devices (SENDs) infringe upon a BriarTek patent and should be barred from importation. BriarTek admits their goal is to pressure 2-way SEND manufacturers to license their patent. There's a lot more to this story, including questions as to the validity of BriarTek's patent.

http://www.equipped.org/blog/?p=504