A system, method, and computer program product are provided for certifying
that data transferred from a first computer to a recipient computer is
free from viruses identified by an anti-virus database. Data is scanned
for viruses before it is sent from the first computer. A certificate
identifying said data as being scanned for viruses is attached if no
viruses are found during scanning. The data is sent with the certificate
from the first computer to a recipient computer.