The Open Archives Initiative has released a draft specification describing rights expressions about metadata in the OAI-PMH framework. The mechanism essentially involves pointing to a rights language schema (OAI is neutral regarding which rights language is used) and then either embedding or referring to a rights expression from within a set of rights tags in the OAI metadata. The rights described apply specifically to the use of the metadata itself, not the resource described by the metadata (but you have to assume a similar mechanism for resources would be the way to go). For me, the important thing is the ability to point to a rights expression by reference rather than embedding it in the metadata. A parallel RSS implementation of a similar specification would also be reasonable. The accompanying press release is also available.
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