I remember a startup that was planning to create browser extension that would add a sidebar to web sites where users could chat directly about the contents (li

I remember a startup that was planning to create browser extension that would add a sidebar to web sites where users could chat directly about the contents (like reddit or HN but inline, next to the page). The interesting thing was the lawyers told them that the minute they monetised it they were on shaky ground wrt copyright: they were effectively creating a "derivative work" by presenting it in a single interface, and making money in that setting from somebody else's content without their consent will always put you into dubious territory. If Google can get into trouble for merely posting a link to and a snippet to content with the honest intention of simply directing users to find content they are seeking, then MS must surely be able to get into trouble for this.