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Hi, I'm new to Sensei, using the free edition at the moment, 
I have found some traffic labelled as 'proxy' which shows 'NordVPN' when drilled down. The devices are android tablets without a NordVPN app visibly installed. Spotify clients are installed.  I'm not sure how Sensei identifies specific applications by their traffic. Is it likely that this is a false positive identification of the NordVPN application or a malicious non-visible app using NordVPN to ex-filtrate data? 
Many thanks