After speaking with an communications attourney at a broadcasting conference, I was surprised [and not surprised] to find out that it is not fully ironed out. When talking music usage, you will hear people use terms like "fair use" and so on. This attourney informed me that "fair use" is not a legal clause, but rather a defence offered in court proceedings.
Again, the RIAA is behind the curve, behind on the technology, and behind the times on this issue. It has been out there for some time and there is little to be shown from them on it.