Lawrence Lessig has commented to his weblog post clarifying his position on using CC licenses for software:
Great questions all, and I’m sorry I wasn’t clear before. We don’t mean to forbid the use with software. We just didn’t write the licenses with software in mind. But if the license fits, wear it. Obviously, adding this into RSS is a critically useful adaptation, and we encourage it.
There is a heated discussion going on over at burningbird.
Denise Howell also discusses CC metadata.
Thanks to Diego for the links.