[Samba] gpg import and verify

[the_wolf at sapo.pt]

thewolf at xxxthewolf:~/samba$ gpg --import samba-pubkey.asc 
gpg: key 6F33915B6568B7EA: "Samba Distribution Verification Key  
<samba-bugs at samba.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

thewolf at xxxthewolf:~/samba$ gpg --verify samba-4.6.4.tar.asc 
gpg: assuming signed data in 'samba-4.6.4.tar'
gpg: Signature made ter 23 mai 2017 04:21:57 -04
gpg:                using DSA key 6F33915B6568B7EA
gpg: Good signature from "Samba Distribution Verification Key  
<samba-bugs at samba.org>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 52FB C0B8 6D95 4B08 4332  4CDC 6F33 915B 6568 B7EA

???