I'm bored and thought I'd answer a few questions for the next few hours if anyone was interested. I work for a company that owns a bunch of networks and one of my jobs is censoring movies that come in.
Basically, taking anything rated PG, PG-13, or R and helping to make it "sanitized" for television.
Best proof I can think of: http://imgur.com/0cLV3
Keep in mind, I don't censor live programming, so I'm not on "the button," but I do know a little about what goes on with that, as well.