Verifies the signature of the data signed with the private key of this certificate
True if the signature is successfully verified.
This method causes TElX509Certificate object to
validate the signature of data contained in
It's a good idea not to trust the data whose signature is invalid.
Note: If the signature includes certificates, they are used for verification instead of certificate, whose method is called. To avoid this, set IncludeCertificates parameter of Sign method to False.