ИСТИНА

Methods and servers for generating a modifiable portion of a digital document which has message slots for placement of digital messages are disclosed. The generating being performed during a first selection-round of a plurality of selection-rounds. The method includes, during the first selection-round: providing access to a first combination of originators that are to bid for message slots during the first selection-round. The first combination is selected by limiting (i) the number of originators that are to bid for message slots, and (ii) which combination of originators are to bid for message slots. The method includes acquiring bidding data for the first selection-round. The method includes triggering placement of digital messages in the message slots of the modifiable portion based on the bidding data, and updating data about the first combination of originators for performing a subsequent selection-round.