This is a good question, I also would like to know the answer. However to avoid this problem when using loops I either buy a non-exclusive license for drum loops or get other royalty free drum loops from sources I know and am sure that I can use without hesitation,without royalties or licensing issues try cruising say the creative commons for what you want you would be astonished at the amount of free content out there or very reasonable content and most places that sell you royalty free licenses give formats that work not only in studio one but other daws alike. I hope they give you an answer but this is what I do instead of having to wonder. Cheers, oh or I just use the instruments and write it