Legality.

Is that like “Fatality” or “Babality” in Mortal Kombat? An excerpt from Wired says it all.

In an appropriately glib statement, Parker and Stone said they were inspired to start the site when they got “really sick of having to download our own show illegally all the time. So we gave ourselves a legal alternative.”

Source: http://blog.wired.com/underwire/2009/03/stone-unveils-s.html