I'm not talking about scene ripping, where things are pretty much already perfect for that sort of thing - I'm talking about all of the other rips or original content that tend to start as personal use and come from (16mm, VHS or Laserdisk -> Various equipment ->) Numerous DVD editions -> Any number of programs -> Any number of formats.

Maybe a half-automated/half-manual registration of files and statistics into a somehow curated distributed database? Maybe magnet links could double as file fingerprints?