Here's some other bits which I had forgotten/missed when discussing the Library of Congress issue. Mr. Leggett got back to me today as well, since when signing up for the press section, I had asked a little bit about the ESB issue. He wrote back with a similar statement that zombie received, and after asking a few more questions here's the gist.

Should have realized this earlier (since I did it...) but when you register a copyrighted work with the Library of Congress, typically you submit two copies. So since we are discussing a high profile films, all versions of SW most likely have two copies submitted, shortly before or after release. (he mentioned that pre-print versions are on occasion submitted for movies, but mostly it's 35mm, and from the era of the OT sometimes films which were in theaters.) Deposit information we should all be able to get using their online search system:

(i'll try to track down the actual records tomorrow) These deposit copies are records so that if a lawsuit does come about, the Library of Congress version can be used as reference, and they are available for on-site research purposes.

The National Film Registry is in some ways like a back-up for 'the best', at the time of inclusion they return to the creator or company and ask for a new print.

The clips online in the press room have no relation to the archived material, they were just whatever could be quickly gathered. So the Yoda clip doesn't mean anything.