I've finally got started with SoundCloud, and when using the upload function I realised that this could be a great illustration of how simple the question about file sharing really is: When uploading you choose between 'all rights reserved' or 'creative commons' for the license of the uploaded file. Then you can also choose if others are allowed to download your clip or not. But legally the license question is the vital question for how your soundcloud clip is allowed to be shared and spread. Without going in to exactly how the different license options work, I would like to state it as simple as this – if you want your audio clip to be able to be shared by anyone, choose 'creative commons'; if you do not want this, choose 'all rights reserved'. (I'm assuming here that you have full rights to the stuff you're uploading in the first place.) For the user/listener the point can be stated even more simple – if the copyright owner allows sharing, feel free to share as much as you want; if the copyright owner does not allow it, please respect that! Please comment on this if you're of another opinion or if you think I'm missing out on something!