Apple Incorporated is expanding the free educational content available on its online iTunes Store in a new category called "Beyond Campus" within iTunes U, a free service which Apple has offered to universities since 2006 to distribute their course lectures or other digital content. The schools decide whether they want to open the free materials to the public or limit access to students and alumni. Apple has started with six partners, including public radio producer American Public Media, Smithsonian Global Sound, The Museum of Modern Art in New York, and KQED public radio and television in San Francisco. The iTunes U material is accessible on Windows-based or Macintosh computers and transferable to portable devices.