> If someone puts up a 600mb file called 'Thor (2011)', what do you think it's going to be.

It's my most recent dataset for a Thorium reactor design. Or it's a catalog of theses that mention a certain Norse guide.

> I guess what I'm saying is are they supposed to download and watch every single file?

Yes. They're claiming ownership.

Let's look at it from the other side - how can the upload site know who owns the copyright for something?