I am looking for a module (beyond the Media Gallery module) that allows content creators to licence the content they create by means of the Drupal WCMS under one of the Creative Commons licenses. Is there a module for this?
Yes, in addition the the Creative Commons licensing support that is integrated in the Media Gallery module, there exists a module for that does exactly that: the Creative Commons licenses module. From the project page:
It was originally written for D6 and is still under development for D7 (up to alpha2 at the time of writing), but the core functionality is in place.
Somebody may ask:
The answer is that there is a lot more to Creative Commons licensing than just linking content to the CC license.
I think that reading the road map for the D7 port will shed some light on what is desirable, and why you need a module to accomplish it. To summarize: When licensing content under Creative Commons it is highly desireable that RDFa and ccREL metadata is properly presented, and you need more than a link for that. A CC search option should also be is available.
Looking at the issue queue for the Creative Commons module, it looks like development may have stalled when it comes to porting the more advanced features of the D6 version to D7, but I think it still is worth checking out.