Did Led Zeppelin Lift 'Stairway to Heaven' From Spirit?

Do you think that Led Zeppelin stole the opening riff's of "Stairway to Heaven" from Spirit's song Taurus?

According to Ultimate Classic Rock, here's the deal:

Earlier this year, the children of Spirit guitarist Randy California (born Randy Craig Wolfe) filed suit against Led Zeppelin for copyright infringement on the grounds that the opening riff from 'Stairway to Heaven' was appropriated from 'Taurus.' They are seeking monetary damages and co-writing credit. Led Zeppelin opened for Spirit in 1968, the year 'Taurus' was released.

Listen to both songs below and you be the judge!

Led Zeppelin's "Stairway to Heaven":

"Taurus" by Spirit: