The popular Web site -- founded by NBC, Fox and ABC three years ago -- allows users to view HD-quality episodes of some of most popular TV shows, like "Grey's Anatomy," "Bones" and "The Office." Only the most recent shows are available, going back about five episodes.
Currently, users do not pay for the content, but see ads during viewing. There are also banner ads on the site.
But high-ranking officials from Fox and NBC have expressed a desire to increase earnings for HULU, for which the bandwidth costs are enormous.
This week, the Los Angeles Times quoted a source close to HULU as saying the Web site was looking at a subscription-based model that would allow viewers to see a show's entire back catalog. The $4.99 fee would grant access to the entire library of content. Another subscription-based model would allow users to view shows ad-free.