520 ILCS 20/18

At the Department's discretion, in lieu of other charges, a fee in addition to the regular license may be charged by the Cooperators, in return for which the hunter will receive a permit to hunt on Cooperative areas. Any surplus of funds collected over the cost of the program is to be used for farmer-hunter benefit (directly or indirectly to the hunter) by benefiting the farmer and creating good will for the hunting program.