So the original question was how to signal that files uploaded by users to the FCC were not created by the FCC. Some people suggested entirely different domains, but that's hacky and doesn't really solve the issue. And maybe the content should be hosted on a subdomain for security reasons, but that still doesn't solve the issue of signaling that it wasn't created by the FCC.

I suggested just adding a ~ to the domain name, because when you see a domain name like this:

http://www.cs.columbia.edu/~allen/

It's universally recognized that the content on that page was not created by columbia.edu or cs.columbia.edu in an official capacity.

Other people said we can't do this because it's not an official standard, so I said let's just make it a standard. Which I think is good because it keeps an important piece of Internet culture alive by codifying it, which would let people rely on it when designing new systems. And ultimately it should work because there is no history of this URL pattern being used for non-UGC content.