Smart TV detection of STB user-control screen-area actions related to STB-originated content presentation

A method is performed using a smart TV, which receives from a television signal source device a television signal feed encoding primary television content and then presents that content. The smart TV receives data via the computer network, including first data representing a to-be-replaced portion of the primary television content and second data representing secondary television content. Using the second data, the smart TV automatically presents the secondary television content in place of the to-be-replaced television content. The method includes the smart TV: (a) automatically monitoring, during presentation of the secondary television content, the television signal feed and comparing it with the first data; and (b) automatically altering presentation of the secondary television content in accordance with a user-control action with respect to the television signal source device, in response to detecting any difference between the television signal feed and the first data indicative of that user-control action.