Opening a new front in a heated patent war, Palo Alto Networks and its lawyers at Morrison & Foerster sued Juniper Networks in Santa Clara County Superior Court this week, seeking to upend a settled doctrine of patent law.

The two network security firms have been embroiled in litigation in Delaware since 2011, when Sunnyvale-based Juniper Networks sued Palo Alto Networks for stepping on a half-dozen key patents related to firewall technology.

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