Rick Allen of Def Leppard says he has a case and could actually sue One Direction because they ripped off one of their biggest hits....But Def Leppard says they won't sue because they're flattered.

Rick tells TMZ that any fool can hear the similarities between their 1987 hit "Pour Some Sugar On Me" and 1D's "Midnight Memories."  

Rick says he has a case, but won't take it to court because the band is taking it as a compliment.

So what do you think??  Be the judge and comment below.

Well, it's pretty close.  Comment below if you think that Rick Allen has a case.