In Canada, CBS network programming is carried on cable, satellite and IPTV providers through affiliates and owned-and-operated stations of the network that are located within proximity to the Canada–United States border (such as KIRO-TV in Seattle, KBJR-DT2 in Duluth, Minnesota, WWJ-TV in Detroit, WIVB-TV in Buffalo, New York, and WCAX-TV in Burlington, Vermont), some of which may also be receivable over-the-air in parts of southern Canada depending on the signal coverage of the station. Most programming is generally the same as it airs in the United States; however, some CBS programming on U.S.-based affiliates permitted for carriage by the Canadian Radio-television and Telecommunications Commission by Canadian cable and satellite providers are subject to simultaneous substitutions, a practice in which a pay television provider supplants an American station's signal with a feed from a Canadian station/network airing a particular program in the same time slot to protect domestic advertising revenue.