STAIRWAY TO HEAVEN RIFF: Where did Spirit get that riff from before Jimmy Page?

People are so fucking stupid. Can you imagine the person who thinks that Spirit invented that riff? OMG. That is a classic riff that was played 1000's of times before any hippie ever played it. Here is an example. And that chord progression goes back to the 30's and before. Probably back to ancient lute music. From Greece or Spain?

So who really has the rights to that riff? No-fucking-body