Did Netscape say that a mail you received had an invalid signature ? Perhaps you forgot (or did not know that you was supposed to) load the signature of this Certificate Authority.
This CA is mainly for authorizing certificates for me and my family, but I can issue certs for other persons as well. Look in the policy document for the conditions under which this is done.
All cryptogaphy in this CA is done with the help of the SSLeay library and programs.