In 1969, the Federal Communications Commission (FCC) began to impose restrictions on the common ownership of print and broadcast media in the same market. The combination of the "Detroit News" and WWJ-AM-FM-TV was given grandfathered protection from the new regulations. But by the mid-to-late 1970s, the Evening News Association was under pressure to break up its Detroit cluster voluntarily. Fearing that an FCC-forced divestiture was imminent, the Evening News Association agreed to trade WWJ-TV to the Washington Post Company in return for that company's flagship station, WTOP-TV (later WDVM-TV and now WUSA). On July 22, 1978, due to an FCC regulation in place at the time that forbade TV and radio stations in the same market but with different ownership groups from sharing the same call signs, channel 4 changed its call letters to the present WDIV-TV, for Detroit's IV (representing the Roman numeral for 4). Additionally, in a series of promotional announcements with news anchor Dwayne X. Riley, the new call letters were said to represent the phrase, "Where Detroit Is Vital". The WWJ-TV call sign was later adopted for use by the former WGPR-TV (channel 62), after its 1995 purchase by CBS, which had acquired WWJ radio in 1989; the current WWJ-TV is a separate entity and not related to WDIV.