Correct me if I'm wrong... in Led Zeppelin Master Forum Posted August 29, 2010 "parody" is specifically permitted by U.S. copyright law. For example, Weird Al does not need to get permission for his parody versions (even though he always asks permission as a matter of courtesy.) However, when you are using parody to advance a specific agenda (which Jimmy Page and Robert Plant may not agree with), then you might cross a line to where you're no longer protected under the law. Here is a quote from Wikipedia: Since this politician's song is a parody of his opponent (and NOT of the song "Stairway To Heaven"), then he might not have a case. I would be interested to hear what Mr. Page and Mr. Plant would say about this.