Research analyses of the HathiTrust Digital Library collection indicate that about 1.15 million of the more than 5.16 million unique titles in the digitized collection-or about 22 percent-are in the public domain. These estimates exclude the large number of publications that might be classed as "orphan works," for which some copyright exceptions can be exercised. By some accounts, orphan works may account for as much as 50 percent of the digitized volumes in the HathiTrust collection (Wilkin 2011).
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