Google Toolbar

There is more fuss and bother over the Google Toolbar and its ability to change (on user request) various things into links. Some people suspect it might be infringing on copyright by editing the document. I haven't examined it closely (mainly because that would involve plugging a monitor into my Windows PC and booting it up for the first time this year), but I was under the impression that the toolbar edited the document on the end user's PC. Wouldn't this be akin to the VCR issue? Google doesn't alter the document, they just provide a tool which allows the user to. (IANAL)