5/7/09 9:09:34 AM /usr/sbin/ocspd[18764] starting
5/7/09 9:15:56 AM /usr/sbin/ocspd[18774] starting
5/7/09 9:31:07 AM /usr/sbin/ocspd[18820] starting

From the Man pages, OCSPD is responsible for (security) Certificate Revocation List & Online Certificate Status Protocol responses. In other words, it handles the heavy lifting portion of the security management for Mac OS X 10.4+. OCSP is an internet protocol used for obtaining the status of an X.509 certificate.

Overall, OCSP is needed for Security Certificate verfication, and perfectly normal for day to day operations. OCSP is not intended to be invoked directly by the user….