<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Good evidence of commercial impact, and the damage of orphan works: </div><div><br></div><div><span style="background-color: rgba(255, 255, 255, 0);">Heald, Paul J. and Erickson, Kris and Kretschmer, Martin, "The Valuation of Unprotected Works: A Case Study of Public Domain Photographs on Wikipedia" (February 4, 2015). <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="en:Digital object identifier" target="_blank">DOI</a>:<a href="http://dx.doi.org/10.2139%2Fssrn.2560572" target="_blank">10.2139/ssrn.2560572</a> Available at SSRN: <a href="http://ssrn.com/abstract=2560572" target="_blank">http://ssrn.com/abstract=2560572</a></span><br><br>Michael </div></body></html>