Comment What does a site want in Google's index? (Score 1) 611
They can embed the whole site in a DRM-ed Flash or Silverlight wrapper
Which means your favorite general-purpose web search engine can't see it to index it. Of course, a site could provide just the title, author, and abstract without digital restrictions management and get those in the index, similarly to how Elsevier journals and WSJ.com present articles to anonymous visitors and to logged-in users whose subscription has lapsed.