I've done some hacks to the notes package and lars-blogger package to can choose a license when I publish an article in my blog.
I explain widely why I think that is important can choose a specific license when someone publish something here
I think that would be a nice feature to do a licenses package. I've some ideas about this development:
A name and a link to the official license site is sufficient to a datamodel license, but set locales in a similar mode to categories will be interesting due to licenses like Creative Commons does a big effort to internationalize licenses. Perhaps a local copy of the full license could be interesting or perhaps not.
I think that the site-wide administrator must be the people who manage licenses (add, edit and remove).
When the license package is finished would be good include the licenses option in lars-blogger, photo-album, content-repository, ... Step by step.
Someone is doing something similar?