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Cornell University librarians added up the money and time spent clearing copyright on 343 monographs for a digital archive of literature on agriculture. Although the library has spent $50,000 and months of staff time calling publishers, authors, and authors' heirs, it has not been able to identify the owners of 58 percent of the monographs. "In 47 cases we were denied permission, and this was primarily because the people we contacted were unsure whether they could authorize the reproduction or not," says Peter B. Hirtle, who monitors intellectual-property issues for Cornell's libraries. "Copyright is supposed to advance the sciences and arts, and this is copyright becoming an impediment to the sciences and arts." Chronicle of HE zitiert nach den Open Access News.