What are Out-of-Print Works?
A work which the rightholder has decided is no longer commercially available regardless of the existence of tangible copies of the work in libraries and among the public.*
* Definition as in the Final Report of 3.06.2008 of the High Level Expert Group (HLEG) - Copyright Subgroup on European Digital Libraries established by the Eurupean Commission in relation to the i2010 Digital Libraries initiative, as adopted by the HLEG on 4 June 2008.