Small wonder that she's the go-to copyright and trademark expert for so many media outlets. Perhaps you heard her Planet Money segments on which superheroes are in the public domain:
www.npr.org/transcripts/...
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npr.org
We Buy A Superhero 2: Loophole : Planet Money
Marvel was not interested in selling us Doorman. But there is another way to jumpstart our superhero empire. | Find the full Planet Money Superhero series here.