VirnetX Holding Corp., an Internet security software and technology company, is suing Apple, Aastra, Cisco and NEC for patent infringement. The lawsuit was filed in the United States District Court for the Eastern District of Texas, Tyler Division, the patent lawsuit capital of the universe.

VirneX claims the companies violate five of its patents that involve virtual private networking (VPN) connectivity. The company received a US$200 million settlement from Microsoft in May on similar complaints.

One patent cited in both lawsuits, titled “Agile network protocol for secure communications with assured system availability,” describes technologies for creating and managing a virtual private networking (VPN) connection, notes “Computerworld” ( VirnetX has asked for both unspecified damages and injunctive relief.