Symantec has been ordered to pay Intellectual Ventures $17m for infringing on two patents relating to anti-virus and internet security technologies.
The US District Court for the District of Delaware announced the ruling, but awarded Intellectual Ventures significantly less than the $298m it was seeking.
Symantec was cleared of a third patent infringement claim by Intellectual Ventures.
"We are grateful to the jury for their hard work and for confirming the validity of these patents," she said.
"We remain committed to defending inventor rights and protecting the interests of our investors and customers."
Intellectual Ventures began its legal campaign against Symantec in 2010 as part of a wider case against McAfee, Check Point and Trend Micro.
McAfee and Check Point settled the cases in 2012 and 2013 respectively. The Trend Micro case is scheduled to start in May.
A Symantec spokesperson told V3 it is considering appealing the verdict.
"We are pleased the verdict came back for substantially less than the $299m that Intellectual Ventures was seeking, and are considering our options to reduce the damages even further."
The litigation is one of many heated patent infringement campaigns going on in the technology sector.
Battles between several big name players, including Google, Microsoft, Apple and Samsung, have been fought over the past three years, leading many vendors to invest considerable time and resources in bolstering their patent portfolios.
IBM has been the most proactive patent creator over the past year and was awarded 7,500 patents in 2014, according to stats from US patent clearing house IFI.
Samsung was the second most active creator and was awarded 4,952 patents, followed by Canon with 4,055, Sony with 3,224 and Microsoft with 2,829.
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