ABC, CBS and NBC are blocking TV programming on their websites from being viewable on Google Inc.'s new Web-TV service, exposing the rift that remains between the technology giant and some of the media companies it wants to supply content for its new products.

Full-length episodes of shows like NBC's "The Office," CBS's "CSI: Crime Scene Investigation," and ABC's "Modern Family" can't be viewed on Google TV, a service that allows people to access the Internet and search for Web videos on their television screens, as well...