Batch editing Dublin Core elements

Does anyone know of a way to batch edit just a single metadata element for multiple items? In this case, I want to edit dc:rights so it has the same boilerplate rights statement on each item. Right now we just have a Creative Commons license on the site's footer, but my supervisor would like the rights to be clearly stated at the item level. Any help to keep me from having to do this manually would be greatly appreciated!

I'm using Omeka 1.5.3.