I think they hardly do, they could get in trouble.
You could try this: <a href="http:&#x2F;&#x2F;www.ibtimes.co.uk&#x2F;i-can-haz-pdf-academics-tweet-secret-code-word-get-expensive-research-papers-free-1525241" rel="nofollow">http:&#x2F;&#x2F;www.ibtimes.co.uk&#x2F;i-can-haz-pdf-academics-tweet-secre...</a><p>I&#x27;d like to share but I have seen often that a cover page is added with an IP address which can lead to problems for the sharer, perhaps meta data is also added about the download? One can only hope researchers will once avoid closed journals. I think they should, especially when they are paid by public money.