Updates:Tupac Letter Auction; Former Friend Tells Madonna, We Had A Deal, You CAN'T Sue Me

Madonna's former friend says she has no right to get a restraining order against her for trying to auction off a letter Tupac wrote the singer, and the former friend is asking a judge to unblock the sale.

Darlene Lutz -- Madge's former art consultant and friend -- filed docs saying she and Madonna settled a very bitter dispute back in 2004 ... and part of the deal was that Darlene gave Madonna cash and in return Madge agreed never to go after Darlene for anything.