It would all be automated. Of course the RIAA could send such requests, but they'd have to lie. Gaining entry under false pretenses in order to see what you have in your computer would undercut their civil case. Invitation only requires a criminal search warrant to circuvent. No one has a legal authority to falsely gain access to your home or computer contents. It is only by invitation or by court authorized search warrant.

The concept here is to establish the terms of entry. A contract if you will.

It is all automated -- you could add this capability to standard Gnutella clients. The mere fact that the request and invitation are well known as part of the protocol would mean that people such as RIAA could not have a good faith excuse to look into anyone's computer file shares. They could only see the contents by lying about who they were -- false pretenses which undercut their civil case because they had to engage in fraud to gain entry.