Many thanks to Erwin van Hunen at Doppler Radio (and to Steve Holden for bringing it to his attention) for helping straighten out an issue I created when I tried to add the Creative Commons element to my hand-rolled podcast RSS feed. Namely, I hadn't added the proper namespace
xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule"
to the XML file. Fixed now, please let me know if you spot other hiccups.
This goes to what I was saying in my recent podcast: I'd be surprised to see a court penalize an ordinary user on the copyright front for failing to offer pristine or adequately informational feeds.
Creative Commons has a section (addressed to "Developers") on Using Creative Commons Metadata, and notes: "Syndic8 tracks RSS feeds that are available under a Creative Commons license."