[Serusers] Error message: Header V3 DSA signature:

[S.A.S. Lorensuhewa]

Dear All,

I got following error message while installing ser rpm. What is the meaning 
of this. 

arning: ser-0.9.6-6.fc5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 
1ac70ce6 

Aruna 

 ----------------------------------------------------------
S. A. S. Lorensuhewa
Head, Department of Computer Science
University of Ruhuna, Matara, Sri Lanka
Telephone: 0094 (0)41 2227019
Fax: 0094 (0)41 2222683
Email: lorensuhewa at cc.ruh.ac.lk,  aruna at cc.ruh.ac.lk