Think about it... Enough drivers use what we have created and know about us that FELD would have to be some kind of special retarded not to know about us. Have we been sued or asked to stop doing what we have been? No. Will we? No. Like Danny said,if your not making profit, legally there is nothing anybody can do to stop us. That's the beauty of the U.S. Justice system. We are technically avoiding prosecution and having to pay royalties through a loop hole.
Then there's this: not the best example, but the best I could find/remember. http://www.usatoday.com/story/news/nation-now/2014/02/10/dumb-starbucks-parody-free-coffee/5357597/
Basically a Coffee shopcalled Dumb Starbucks was legally able to operate without violating any copyright laws because it was considered to be a parody. Everything was the exact same as Starbucks doe to the logo, but the added the word dumb before everything. It was considered a work of parody art; the coffee Bering the art.
Weird Al has been doing this for years.