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http://creativecommons.org/weblog/entry/33768As reported a few weeks ago, OCLC has recommended that its member libraries adopt the Open Data Commons Attribution license (ODC-BY) when they share their library catalog data online. The recommendation to use an open license like ODC-BY is a positive step forward for OCLC because it helps communicate in advance the rights and responsibilities available to potential users of bibliographic metadata from library catalogs. But the decision by OCLC to recommend the licensing route — as opposed to releasing bibliographic metadata into the public domain — raises concerns that warrants more discussion. [...]There are good reasons for relying on community norms for metadata attribution instead of requiring it as a condition of a licensing agreement. The requirement to provide attribution through a contract like ODC-BY is not well-suited to a world where data are combined and remixed from multiple sources and under a variety of licenses and other use restrictions. 