I'd argue that it WOULD be okay to repost sound files. Just because someone was the first to string together a set of information means that nobody else is allowed to share it?
As a musician, if I posted a piece of music to a site that permitted it to be played in their Flash player on the site, this does NOT mean I want it to be distributed does it? Unless I explicitly stated that it was alright to distribute it.
EDIT: I didn't mean this to come across as snappily as it did btw!