The knowledge of Led Zep plagiarizing material has been known since at least the mid 70s. These guys are rather late to the party in their revelations. I even recall hearing Willie Dixon discussing his run-in with Zep on local radio back in the mid to late 80's...
What is appalling is the sheer gall of Zep in just trying to pass off other's work as their own. Other bands (Stone, Cream, Beatles, etc.) often went out of their way to make sure it was known where some of their songs or covers came from; with Zep its like pulling teeth...
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