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Level 9

By adding the certificate (public key) to your "Trusted Identities" you are configuring Acrobat\Reader to recognize and trust signatures created using the corresponding private key (only trhe signer has access to the private key).

As for revoking certificates...

As an end user consuming signed documents, you cannot revoke digital certificates.  Only the issuing Certificate Authority (i.e. VeriSign, or a company's internal certificate server).  If a certificate is revoked, then going forward this status will be reflected in any signatures created using the revoked certificate (private key) whan a signature is validated.  If the certificate is "self-signed", meaning the user created their own digital certificate, then there is no mechanism to revoke the digital certificate.

If you wish to remove the "Trusted Identity" on the client machine, then this is done with Reader bey selecting from the menu Document > Manage Trusted Identities and then selecting and deleting the trused identity.  In Acrobat, the menu option is Advanced > Manage Trusted Identities

Regards

Steve