Fetch CRL is a utility that updates Certificate Authority (CA) Certificate Revocation Lists (CRLs). These are lists of certificates that were granted by the CA, but have since been revoked. It is good practice to regularly update the CRL list for each CA to ensure that you do not authenticate any certificate that has been revoked.
This utility was originally developed by the European Data Grid (EDG) project. It ran as a daemon, and fetched the CRLs on a daily basis. As of VDT 1.3.11, it now runs as a cron job.
Fetch CRL is currently maintained by David Groep from the EUGridPMA.