Royalty-free, or RF, refers to the right to use copyrighted material without the need to pay royalties or license fees for each use or per volume sold, or some time period of use or sales.
http://en.wikipedia.org/wiki/Royalty-free

So far there's only one label on cctrax releasing under this license. Cold Tear Records state the following on their website:

About sharing our stuff:

We don’t mind if our music get shared on torrent networks, or any peer-to-peer download networks. However it doesn’t always fit with our digital distributor which works in purely commercial ways. But at the same time we need our distributor as they provide us with some income, which helps us moving this label forward.We also don’t mind if you upload our music to youtube. Actually quite the opposite, we encourage putting our music there. We may even get payed some royalties because of that. Also feel free to play our music on your internet or fm radio show. If anyone says otherwise, don’t believe them and contact us if you have any problems doing that.Although we appreciate when you let us know when you use our music, but just because we enjoy knowing that it is being listened and played all around the world.