Creative liberties slice-nsing

Chris of Matchbook Films talks about the Creative liberties badge he has on his blog and what it means:

"When a video is marked with this stamp, it signifies that I've made use of someone else's copyrighted materials without obtaining their permission. If someone associated with the materials in question believes that my noncommercial videoblogging use is infringing or otherwise doing harm to their copyright, please up and say so. I'm a reasonable man.

Creative commons artists hoping to remix these works do so at their own risk. But it should be pretty obvious what's safe and what's not."

Interesting idea.

Eric Rice has talked about a similar situation and calls it Creative Commons 'Slice-nsing':

I'd want to put a Creative Commons license on *part* of my work.

Is there such a thing? Should there be a Slice-nsing model for this? How can I do this in a world where I don't own the rights to all the content on my show.