Shuttleworth told iTWire: "Very simply, Canonical has no Open Core products nor any plan to adopt it as a strategy.
"Bradley's commentary is based entirely on speculation. I'd encourage anyone interested to read the transcript of the questions I was answering on IRC during Ubuntu Open Week."
In his article, Kuhn tried to find an answer as to why Canonical asks contributors to assign copyright to the company, instead of allowing them to retain it themselves. (corrected)
Earlier this year, when Jonathan Corbett of LWN questioned this policy and said he had been unable to get a viewpoint from Shuttleworth, the Canonical owner promptly responded to a query from iTWire, and at length, outlining his company's stance.
Kuhn initially criticised Shuttleworth for the views outlined in that article.
Shuttleworth did not touch on any of the other points that Kuhn has raised in his recent Open Core piece, adding that he would answer it at length as soon as the upcoming Ubuntu Developer Summit was over.
Kuhn had raised an interesting point, that Canonical chief executive Jane Silber had recently visited the GNOME Foundation (corrected) while licence requirements were being documented, to ask that GNOME contributors abandon their longstanding preference for no copyright assignment.