International Rights Statements Working Group has released Requirements for the Technical Infrastructure for Standardized International Rights Statements.
Here's an excerpt from the announcement:
Over the past fifteen months, representatives from the Europeana and DPLA networks, in partnership with Creative Commons, have been developing a collaborative approach to internationally interoperable rights statements that can be used to communicate the copyright status of cultural objects published via the DPLA and Europeana platforms.
The purpose of these rights statements is to provide end users of our platforms with easy to understand information on what they can and cannot do with digital items that they encounter via these platforms. Having standardized interoperable rights statements will also make it easier for application developers and other third parties to automatically identify items that can be re-used.