OCLC pilots WorldCat Copyright Evidence Registry / OCLC, 25 August 2008
http://www.oclc.org/us/en/news/releases/200832.htm
"The Worldcat Copyright Evidence Registry is a community working together to build a union catalog of copyright evidence based on WorldCat, which contains more than 100 million bibliographic records describing items held in thousands of libraries worldwide. In addition to the WorldCat metadata, the Copyright Evidence Registry uses other data contributed by libraries and other organizations."