Ten years ago my colleagues in a grad program (at a US university) produced a paper but it was never published (in a formal journal or website). It was only distributed by email to the department and friends at other universities. Last week a professor contacts a member of our group requesting for a copy of the paper, but it turns out none of us have the final version (but we're all in agreement to share it). After some googling we find it's hosted on Scribd. I sign up for a free account (with ccard info), use the free trial to download the paper, then delete my account before my ccard is charged. I believe this professor wants the paper only as a survey reference and maybe to use for teaching, but I'm worried about a worst case scenario that my downloaded copy gets uploaded to another repo service.
Questions:
It was never published, so are there any copyright issues and our group can share as we please (as the original authors)?
Does Scribd have any domain over the particular copy since they provided access as paid service? (Would they embed some unique token that could track to me, or does #1 override this?)