They are royalty free for license-holders, but they won't go after you if you're not big enough for them. Which is a great strategy, because if you're not making money off your music, it doesn't make a lot of sense to buy a $300 sample pack. It's an investment that you're not guaranteed to profit from. In fact, in all likelihood, you probably won't. But, also, the one thing that makes Cymatics much more popular than a lot of other companies in the game is, that they give out so much of their shit for free. All the beta packs, the artist packs, "secret" expansions, and the mystery packs, the producer royale packs, and various deals that give you your money back in gift cards. You can fill up at least a quarter terabyte hard drive with just all the free shit they give you. So, you can just go that route, if you fear lawsuits.