I added a note to http://wiki.creativecommons.org/Nonweb_Tagging#For_Developers
This is a developer-oriented document for a bleeding edge developer oriented feature. This has two implications:
* Do not attempt to implement as a creator. If your software doesn’t transparently handle CC metadata for you (you should only have to select a license), do not attempt to do it yourself.
* Read our non-technical account with explanatory comics first.