If I use one of the premade riffs in FL Studio in a song I'm writing and plan to eventually put on a record, would this be considered copyright infringement or something like that?
i think if they let you use it for free is cause its ok, id say. id go to their official site and ask in the forum if they have one, or on the contact page.
All samples are royalty-free. This means that you can use the samples in your own compositions and songs without paying any further royalties.

not sure if the samples they are talknig about are the same as what you are talking about, but there you go.

you should still visit their site and read it for yourself though.
If you had been liable, you could have just played it in a different key or changed the beat or something. But you're not so it doesn't matter.
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