That's pretty much what I'm thinking too. And you don't even need to submit a copy, but rather just a cryptographic hash of your file. But there's still the is

That's pretty much what I'm thinking too. And you don't even need to submit a copy, but rather just a cryptographic hash of your file. But there's still the issue of proving that you haven't manipulated it before handing it in, and here I can't seem to think of anything better than the recording and hash submission being done by a DRM'd tool out of the individual's full control.