I can't really see this as a rip off. Originally the Yardbirds played the song with altered music and then Led Zeppelin with altered lyrics added to the altered music. I know it's still similiar and based off the Holmes song but I think that by the time it was recorded the Zep version was different enough from the original to not be a case of plagerism. A judge, other fans, or the artists themselves may see it differently but that's what I think. This is a very common thing in music just nobody seems to care unless it's with Led Zeppelin for some reason. Alice Cooper admitted that his song No More Mr. Nice Guy is an altered version of a song by The Who. He even told one of the members (Roger Daltery I think) and he didn't care. He still liked the song. The song is stilled credited to Alice Cooper and Michael Bruce. No one has sued anyone to my knowledge and no royalties are being payed. In fact, listen to No More Mr. Nice Guy and The Substitute and you'll hear the simliarity yourself. Of course if I was Jake Holmes I might want to sue also so I'm not judging his actions since I'm not in his shoes. I'm just glad it's resolved.