Stairway to Where?

In 1968 and 1969 a band named Spirit played four gigs with Led Zeppelin.  Led Zeppelin I, II, III are due to be re-released in June.  On the presumption that Zeppelin IV will eventually follow, lawyers for the family of deceased Spirit guitarist Randy California are suing, claiming Led Zeppelin stole the intro to Stairway to Heaven from the Spirit song "Taurus".

You be the judge, the piece in question starts at about 0:45 in the Spirit song: