Packman and certificates

If I download a package from Packman and install it directly, I get this warning: libvo-amrwbenc0-0.1.3-pm151.1.4.x86_64 (Plain RPM files cache): Signature verification failed [4-Signatures public key is not available] Of course if I add the repository this is all managed. But if I want to just install the RPM direct, is there a package with the certificates that I can install so this message is not given? -- Roger Oberholtzer