Since the Rights Element is my responsibility for our class project, I have been thinking about the appropriate language to use to make sure the information is both understandable and reasonably aligned with rights language in other digital libraries. I checked to see if there is a controlled vocabulary that we might use, but found that while much attention has been paid to structure and rules, actual right-hand-side standard terms don't seem to have one standard list. This list of licensing vocabulary from Center for Research Libraries has some useful terms, but it is mostly intended for licensing electronic resources such as databases, journals, and books. PRISM offers a very minimal list of right terms. Creative Commons provides a clearer set of terminology, adapted for RDF, and several linked data licensing vocabularies are rounded up on this handy site.
For our project, keeping it simple will probably be the best course of action, but it is interesting to see how this might be handled in a linked data environment--and to realize how important proper encoding of rights data could be in an environment where the images in your digital library could be linked to outside resources in unexpected or imagined ways.
Doubtful you could provide complete Rights info ... so how would you solve the problem of "long tail" questions (i.e., unpredictable/random rights questions) that a Web visitor might have concerning image copyright?
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