Display control apparatus, computer-implemented method, storage medium, and projection apparatus

In a display control apparatus configured to control image data displayed on a predetermined display medium, an information acquisition unit acquires a first information associated with the predetermined matter at a first time and acquire a second information associated with the predetermined matter at a second time after the first time. A determination unit judges whether there is a predetermined change between the first information and the second information. A control unit controls the image data such that in a case where a predetermined change is detected, at least one of parameters including a location, a size, and a shape of a restricted area, in which the displaying of display information including in the image data is limited, is changed so as to achieve the parameter defined in relation to the second information.