Is paid work by the client but offered free to end users considered to be a "commercial product"?

[anonymous_user_b5ea3461]

I have read both the Game-Engine-Technologie von Unreal - Unreal Engine and the Häufig gestellte Fragen - Unreal Engine but our situation relies on the definition of a ‘commercial product’ which lead us to https://www.acquisition.gov/far/current/html/Subpart%202_1.html. But it is still difficult to interpret for our situation.