qubodup is correct. If I were to quote a paragraph from a piece of text that is in the public domain, and my final composition was copyrighted, the original is still in the public domain. My copyright does not change the status of the original, unless the rights to the original were purchased by you or another organization. If that is the case, I'd suggest showing some sort of documentation here.
Just what I needed. I used some of this recording in a soundscape that's part of a flash animation i did for a friend. --> http://www.tinoheeg.de/plankton The text is the last scene from Boris Vian's "Vercoquin et le plancton". Thank you.