ALEXANDRIA, Va., July 28 -- United States Patent no. 12,695,725, issued on July 28, was assigned to SONICWALL US HOLDINGS INC. (Milpitas, Calif.).

"VPN deep packet inspection" was invented by Steven C. Work (Seattle), Prakash N. Masanagi (Seattle) and Christopher D. Peterson (Seattle).

According to the abstract* released by the U.S. Patent & Trademark Office: "Policy enforcement previously available for web proxy access methods is extended and applied to layer 3 packets flowing through VPN channels. With these extensions, a common security policy is possible that is enforceable between VPN proxied access and VPN tunneled access. Equivalent security policy to tunnel based VPN access without comprising the inherent performance, scalability ...