I don't think it represents a significant risk. I don't think it's a copyright issue, quite frankly. It's an issue of whether you trust a particular source. I think what happens over time, as you make the works available, is that you come to trust.... In some instances, you may feel that you're only comfortable relying on the authoritative source.
Law is a good example. Initially many cases and other materials were made available, but lawyers, when citing for court purposes, would still go to official sources, just to be sure. Even the citation system didn't lend itself to allowing people to cite the non-official documents. We've seen this change over time. Now we have neutral citation with respect to court cases. You can more easily cite documents that might not have come from what we previously would have viewed as the most authoritative source.
I recognize, of course, that there is the possibility that someone may take the document, purport that it is accurate, and then make it not accurate, but I don't see it as a significant risk.