Rebeca Saxe of MIT has this notice on her Social Cognitive Neuroscience Laboratory website along with PDFs of her papers.
Electronic versions are provided to ensure timely dissemination of academic work. They can be downloaded for noncommercial purposes. Copyright resides with the respective copyright holders as stated in each article. The files may not be reposted without permission from copyright holders.Why doesn't everyone do this?
She also has a nice TED Talk from a year ago.