So this band Taurus who used to tour with Led Zeppelin, is suing LZ for stealing a guitar riff lasting like 8 seconds, which Led then used as the opening, and immediately recognizable, riff for Stairway. Have a listen to this and see if you can hear the classic Stairway riff. I think I can.....maybe they have a beef.
Surely there's a statute of limitation on copyright infringement. I mean Taurus wrote this in '68 and Stairway was released in '71. Still, that's 43 years ago.