How Mickey Mouse Evades the Public Domain

I get my fill of Disney pretty quick. In the 90s I chose the time period 1920-1950 for my dissertation, because at the time works published in the early 1920s were entering the public domain in the US. I figured I could publish online annotated editions of the works I had studied, as each fell out of copyright. A certain rodent changed all that.

Every time Disney’s beloved mouse is about to enter the public domain, U.S. copyright law magically changes. Does he deserve special protection, or should he be relinquished to society? —How Mickey Mouse Evades the Public Domain