In May, software giant Microsoft settled with little known company VirnetX for $200 million, after the former had been accused of patent infringement.

The patents in question covered methods for establishing Virtual Private Networks (VPN).

Microsoft now licenses the technology going forward.

This week, however, VirnetX has filed similar lawsuits against other technology companies, including Apple, Cisco, NEC and Aastra. VirnetX says each of the companies is currently violating at least one of five of the company's patents relating to network communication.

The company is seeking monetary damages and injunctions against the products.

Without the aforementioned Microsoft settlement, the company was practically dead in the water, with a reported revenue of just $43,920 for 2009.

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