Error: NOKEY, key ID 5072e1f5 ?

[jackky]

Hello,
I'm trying to install MySQL with rpm file giving following command:
$rpm -i MySQL-5.0.15-0.src.rpm but after a while the system give the following message:
warning: MySQL-5.0.15-0.src.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5

When I try to start mysql the system is not able to locate mysqld.pid file.
Give me any clue to get out of this problem.
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