Okay... so if I see a file which has a reasonable file size for what it claims to be, and has say 5 identical files, then am I likely to have 5 sources for it? Or are 4 of them likely still to be spam?

I would ask if there's any way of filtering out the spam, but I think I know the answer to that already.

Thanks for the help, Only A Hobo.

-BM