It means there was no seed and no distributed copies among the others DLing the file.
My favorite (so far) app for getting BTs is Burst!
It will display how many seeds/peers that are there, plus it shows how many distributed copies (all parts of the whole file are eventually distributed fully so that even though there are no more seeds, the file can still complete). When you get the whole file, it will then switch and tell you the % of completion for the others that you are uploading to.
I can then make sure if I see no other seeds will be present if I disconnect, I will stay on longer. If I have to log out for any reason, I know that at most, the ppl will achieve the amount shown in the Distributed Copies until I can come back and reseed it later.
If any are interested in this program, you can DL it at
http://krypt.dyndns.org:81/torrent/download.phtml