DUP activities = Directly unproductive, profit-seeking activities
Activities that have no direct productive purpose (neither increasing consumer utility nor contributing to production of a good or service that would increase utility) and are motivated by the desire to make profit, typically from market distortions created by government policies. Examples are rent seeking and revenue seeking. Term coined by Bhagwati (1982).
Rent seeking: The using up of real resources in an effort to secure
the rights to economic rents that arise from government policies. In international economics the term usually refers to efforts to obtain quota rents. Term introduced by Krueger 1974.

The Web reference is Slovenian, but I remember seeing it in Croatian, too.