I don't really get the difference between Royalty Free / Creative Commons / etc. licensing, copyrighting, copylefting(??), and so on.
But, if I do understand the Audiotool sample rules, is it correct to say that none of that really matters here?
For instance, I can't upload 30 seconds of an "Attribution-only" or "CC-0" track and then mess with that, since I did not make the music?
The problem with using any kind of audio from somewhere else, is that even if it says it's Creative Commons, Royalty free or whatever, you really have no assurance that the content is legally sound. For all you know the person could have just torrented a vengeance loop, added flanger and threw it up on a website. What's more, most free content like this has licencing rules that say something along the lines of "For use in your music tracks and not for redistribution". Once you upload to Audiotool server it's redistribution.
The problem with using any kind of audio from somewhere else, is that even if it says it's Creative Commons, Royalty free or whatever, you really have no assurance that the content is legally sound. For all you know the person could have just torrented a vengeance loop, added flanger and threw it up on a website. What's more, most free content like this has licencing rules that say something along the lines of "For use in your music tracks and not for redistribution". Once you upload to Audiotool server it's redistribution.