The word "inspired" used for respectful purposes.  "Complete rip off" would make more sense for Slow 'n' EasyCoverdale took so much to the jaw over this blatant use of Zeppelinisms that I don't think his credibility was ever the same.  He did it to great effect though, and was still prominent style when he and the band became stars in 1987.  Think Still of the Night.  Yep.  This earlier track from 1984 clearly shows the band heading in a harder direction.  Out of town?  Listen live on-line.

An earlier line-up of Whitesnake: