Rip Remix Case study
Fragment of a discussion from Library talk:Copyright Resources/Student Copyright Guide/Mash-Ups
I also thought this was an interesting article about mash-ups under the current law: http://www.iposgoode.ca/2009/08/a-stroke-of-genius-or-copyright-infringement-mashups-copyright-and-moral-rights-in-canada/
Here's the link to the full 27page article summarized in the link above: http://www.law.ed.ac.uk/ahrc/SCRIPT-ed/vol6-3/reynolds.pdf