The CNRI Handle Space is how MIT's DSpace creates a persistant name for any object (audio, video, document, etc). It uses a bitstream type which is more specific than a MIME type (which is what is often needed).
" The Handle System, Handle Icon written in Java and available for Internet download at no cost, includes an open set of protocols, a namespace, and an implementation of the protocols." There's also a plugin for browsers. It apparently supports up to 1K resolutions per second.
http://www.handle.net/introduction.html
DSpaces supports access control, search and retrival, and should have been available yesterday.
http://dspace.org/technology/features.html
The specification includes an interesting use of RDF for auditing changes made to the documents:
http://dspace.org/technology/functionality.pdf
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