Old news, but new to me. I just found this out today.
Rihanna's song, "Umbrella" - yeah, you know it's a hit with many a fella, ella, ella, eh - uses a *free*, Apple-made loop named "Vintage Funk Kit 03", included in Apple's Garageband software. Even Wikipedia says so.
So I guess nobody has to feel bad about using the stock loops that come with these types of software programs any more.