Originally Posted by Steve_Knutzen

The edit has been in place at least since the VHS release. Led Zeppelin is notorious for not allowing their music to be used in movies. Cameron Crowe, despite personally knowing the band, was unable to get Stairway for the Untitled release of Almost Famous and couldn't get a song from Led Zeppelin IV for Fast Times (but that kind of works in favor of the scene). On the commentary for the new Dazed and Confused: Criterion, Richard Linklater discusses how he wanted to use Rock and Roll for the end and even sent personal letters to Jimmy Page and Robert Plant. Page agreed but Plant didn't, likely because he wasn't getting along with Jimmy at the time. It took a video of hundreds of extras, crew members and Jack Black pleading with the band to get the rights to about thirty seconds of the Immigrant Song in School of Rock. To license Rock and Roll now-a-days it takes a sizaeable sum of money and its in a Caddilac commercial.