On Google Scholar points us to an information page put together by the Penn Library: A first look at Google Scholar: What's included and what's not. Does a nice job of letting folks know what they can expect from the search engine, but they don't appear to proxy it, since they include the following points:
- When connecting to Google Scholar from an off campus computer that is not on the Penn network, this same full text may not be accessible. Instead, Google Scholar's links may lead you to an offer to purchase an article or report from the company that is providing it. You might also be directed towards a free variant edition on another website, but that might not be the same content as the version in a scholarly publication.
- In order to determine if the Penn Library provides free full text for these items, you will need to search through the Library's web by using the PennText Article Finder or E-Resource Locator.
So IMHO this page could be one step better ;-)