I was recently asked to provide a reference package to accompany a public notice document for online publication. I built my library primarily for personal reference and a large majority of the content is public domain, but some are journal articles that I access via an institutional login. Since I haven't been tracking which these are, I'm a bit at a loss of how to go back & identify those I can't share. Any ideas?

Is there any metadata flag or identifier automatically added when the Chrome plugin uses my library proxy to access content?