Patent ID: 7778666

Claim:
A mobile telecommunications device comprising: a printer module for printing ticket data onto a print medium so as to provide a ticket, said print medium including pre-printed first coded data in a first format and second coded data in a second format, the first coded data encoding first information and the second coded data encoding second information, at least some of the first information being indicative of the print media identifier, the first format being a linear data track, at least some of the second information being indicative of the print media identifier and of a two-dimensional coordinate grid, the second format being a two dimensional pattern; an optical encoder configured for automatically reading said data track during said printing; a processor for decoding the read data track and determining the print media identifier; communication means for communicating the print media identifier to a computer system, thereby causing the computer system to associate the print media identifier with the ticket data printed by the printer module; a sensor module for sensing and decoding the second coded data on the print medium, wherein the processor is further configured for determining the print media identifier from the decoded second coded data and for initiating retrieval of the ticket data associated with the print media identifier from the computer system, wherein the second coded data is further indicative of at least part of a digital signature associated with the print media identifier, and the mobile telecommunications device further comprising: means for determining whether at least part of the digital signature, and means for determining whether the digital signature is authentic, wherein the ticket is printed if the digital signature is authentic.