Look under About ROVI/Customers: http://rovicorp.com/company/2033.htm
TMS is an international leader in entertainment navigation, providing industry-leading databases of TV, movie and celebrity information to thousands of companies that serve millions of entertainment consumers. TMS also creates consumer-facing products that feature our entertainment metadata including Zap2it.com, the entertainment fan site, Channel Guide and DISH magazines, and on-screen program guides for cable subscribers. In addition, we offer services to help our customers increase their revenue, including advertising sales programs and marketing services to attract new subscribers. Our customer list includes many of the largest, most innovative media, software and consumer electronics companies in the world, including: TiVo, Microsoft, Dish Network, Comcast, MobiTV, and The New York Times.
TRIBUNE is America’s largest employee-owned media company, operating businesses in publishing, interactive and broadcasting, including ten daily newspapers and commuter tabloids, 23 television stations, WGN America and WGN-AM.
TMS is claiming to be the data source - and they are not owned by ROVI.