I just ran up2date on new Centos-3.1 installation and received about 5 of these errors. Is this something to be concerned about?

The package kernel-2.4.21-15.0.4.EL is signed with an unknown GPG signature. Continue The package kernel-utils-2.4-8.37.3 is signed with an unknown GPG signature. Continue? The package GConf2-2.2.1-4 is signed with an unknown GPG signature. Continue?

It is using the default sources file from the CD. http://mirror.centos.org/

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