The issue focused on the security of non-repudiable files. The idea is that you can't put the whole file on a computer in the way that you can with a non-repudiable file. It's not so much that you can't put the whole file on a computer, but that you can't put the whole file on a computer in the way that you can with a non-repudiable file. In this case, the issue was that it was hard to test to see if