The Digital Public Library of America, the Creative Commons, Europeana, and other partners have launched RightsStatements.org .
Here's an excerpt from the announcement:
In May 2015, the International Rights Statements Working Group released two white papers with our recommendations for establishing standardized rights statements for describing copyright and reuse status of digital cultural heritage materials, and the enabling technical infrastructure for those statements. After working for nearly a year to implement the recommendations of the white papers, the Digital Public Library of America and Europeana are proud to announce the launch of RightsStatements.org.