SLICENSE: SSF_API_SIGNER_ERRORS

You want to install a new SAP license but getting below error,

rc of SsfLibVerify: 5 = SSF_API_SIGNER_ERRORS = there are signer errors.
uResult = 27 = SSF_API_SIGNER_NOT_OK/SSF_API_RECIPIENT_NOT_OK = Signature not valid / operation not okay for recipient.

Solution

Delete all the old SAP license from the system. Then, you can apply the new SAP license.