[jrochkind1]

Any site that allows users to upload content allows 'copies'. In the sense that a user can easily download and then reupload a copy to any such site.

I'm sure there are _some_ legal fears, which is why they started with the original policy. But they have decided it is likely that the law does not require them to take down copies not specifically identified in the complaint -- just as it does not require other ISP's to identify on their own copies not mentioned in the complaint.

I think the main important point is that a fork isn't _neccesarily_ a copy, it may or may not be, the infringing material may have been added to the 'original' after the fork, or deleted from the copy after the fork.