Patent ID: 8060447

Claim:
A method comprising: selecting, by a transactor server, a watermark from a group of advertisements, wherein the watermark is an advertisement; generating a watermarked document by embedding, by the transactor server, the watermark in a document; transmitting, by the transactor server, the watermarked document in a first validation request to a user computer; displaying, by the user computer, the first validation request; embedding into a second validation request, by the transactor server, an indication of the advertisement that is embedded in the watermarked document; transmitting, by the transactor server, the second validation request to the secure module; displaying, by the secure module, the second validation request; prior to completing a transaction, requesting, by the user computer, a digital signature; in response to the digital signature request and the displaying of the first and second validation requests receiving, by the secure module, a fingerprint; and completing, by the secure module, the transaction by authorizing a digital signature based on the received fingerprint.