There is zero doubt whatsoever that Knobbe is one of the main patent firms working on vplm's behalf.
How anyone can be skeptical about this or be unable to find any connection is mind boggling to me.
My guess is that those who are still skeptical about knobbe's connection to Vplm really haven't done their due diligence. (E.g. Look at the patents themselves, look at the activity happening at USPTO).
As you point out, Knobbe's name along with partner John Carson's name are all over the Vplm patent submissions.
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