Since one source of funds to pay for open access articles is the library subscription budget, it has been proposed that there needs to be a decrease in the subscription cost to the library in order to avoid 'double dipping' where an article is paid for twice – once through subscription fees, and again through an APC. For example, the Open Access Authors Fund of the University of Calgary Library (2009/09) requires that: "To be eligible for funding in this [hybrid open access] category, the publisher must plan to make (in the next subscription year) reductions to the institutional subscription prices based on the number of open-access articles in those journals."[10] On November 12, 2009, Nature Publishing Group issued a news release on how open access affected its subscription prices.[11]