Intellectual Ventures CEO Nathan Myhrvold.
Intellectual Ventures CEO Nathan Myhrvold.

It’s round two of filing complaints against Symnatec for Nathan Myhrvold’s Intellectual Ventures (IV).

IV is suing the security software firm today for the second time in three years. Back in December 2010, Bellevue-based IV filed similar complaints against Symantec and other companies.

No agreement has been reached since then. In the meantime, IV also found new patent infringements on behalf of Symantec. Thus, the second complaint was filed.

“In an effort to protect the intellectual property assets of Intellectual Ventures, we must take steps to stop the use of our patents without license,” Melissa Finocchio, chief litigation counsel for Intellectual Ventures, wrote in this blog post. “We have been unable to reach an agreement with Symantec, and, in addition to their infringement of software security patents, we determined the company’s server and storage management products also infringe IV patents. As a result, we found it necessary to file this second complaint.”

You can view the new compliant, filed today in Delaware federal court, here in PDF form. IV claims that Symnatec knowingly infringed on its patents for several technologies.

Two weeks ago, IV reached its second settlement agreement in its case against manufacturers in the semiconductor industry, signing a license agreement and resolving a patent suit from the case filed in December 2010 against Lattice Semiconductor. That was the same time IV first filed against Symantec. 

Intellectual Ventures reached a similar settlement agreement in January with Microsemi, a maker of semiconductor systems for the communications, defense and aerospace industries.

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