News release: “OCLC is recommending the Open Data Commons Attribution License (ODC-BY) for member institutions that would like to release their library catalog data on the Web. This open data license provides the means for users to share WorldCat-derived data in a manner that is consistent with the cooperative’s community norms defined in the “WorldCat Rights and Responsibilities.” Data can be freely shared subject only to attribution and OCLC’s request that those making use of WorldCat derived data conform to the community norms.”
See also OCLC adds Linked Data to WorldCat.org