It should be noted though that extended quotes properly sourced are not generally a violation of copyright  Id like to see a few examples  We have never to my recollection and knowledge had a legal complaint or threat of any kind about a properly sourced quote  There could be exceptions such as quoting the entire lyrics of a poem or song in a single block quote but that isnt what we are talking about here  Were talking about a block quote of a passage from an academic paper published behind a firewall by Elsevier  I find it very hard to imagine a serious legal issue with that