Mark Matienzo has published "Developing and Implementing a Technical Framework for Interoperable Rights Statements" in DPLA Updates.
Here's an excerpt:
Within the Technical Working Group of the International Rights Statements Working Group, we have been focusing our efforts on identifying a set of requirements and a technically sound and sustainable plan to implement the rights statements under development. Now that two of the Working Group's white papers have been released, we realized it was a good time to build on the introductory blog post by our Co-Chairs, Emily Gore and Paul Keller. Accordingly, we hope this post provides a good introduction to our technical white paper, Recommendations for the Technical Infrastructure for Standardized International Rights Statements, and more generally, how our thinking has changed throughout the activities of the working group.