Patent ID: 8321353

Claim:
A method comprising: embedding, by a server, a watermark in a transaction document relating to a transaction, wherein the watermark is based on an advertisement selected from a group of advertisements provided by an advertiser and relating to the transaction; transmitting, by the server, the transaction document to a computer configured to display the transaction document as a first validation request, wherein an image of the transaction document displayed on the computer includes the selected advertisement and a logo of the advertiser providing the advertisement; transmitting, by the server, an indication of the watermark to a security module configured to display the indication of the watermark as a second validation request, the second validation request including the logo, such that the indication displayed on the security module mirrors the logo of the advertiser on the computer; requesting, by the server, a digital signature from a user of the computer; in response to requesting the digital signature, receiving, by the server, a fingerprint from the security module; authorizing, by the server, the digital signature, based on the fingerprint; and completing, by the server, the transaction based on the transaction document.