One thing I was unable to ascertain from the article was whether Elsevier was going after authors who share the preprint version of their paper, or the one that is typeset by Elsevier. I have published in Elsevier journals before, and I send the preprint to arxiv.org where it will be permanently available for free. Then, after they accept it for publication, they send a PDF of the article typeset as it will appear in the journal, which is the same content, but laid out more professionally. When signing over the copyright, I signed a non-exclusive right to Elsevier, meaning I retained the right to distribute the preprint version of the paper. (This is required as the research was funded by the U.S. government.) I do not have the right, however, to publicly redistribute the Elsevier version of the paper. (Although I don't think they mind my sharing it privately with colleagues).