Usually presets (and samples really) are royalty free. Don't quote me on that. I think a company cannot own a sound,time, nor a synth they did not make in the first place, but they 'can' sue you on the composition(obviously).grats on getting sylenth1, my favorite synth and low cpu! I just made this with it.
http://soundcloud.com/aires/air3s-codge-dharger