| 摘要 |
A method of using a mobile telephone to authenticate a print medium, the mobile telephone being configured for printing on print media predetermined as authentic. The print media has coded data in the form of a plurality of coded data portions, each coded data portion encoding a signature fragment. The mobile telephone has a printhead, a processing means, a print path extending past the printhead and a sensor adjacent the print path. The method comprising steps of using the sensor to sense the coded data provided on a surface of the substrate whilst the print medium is moving along the print path, using the processing means to interpret the plurality of coded data portions and determine the signature fragments from each of the coded data portions, determining a signature from the signature fragments, using the signature to assess the print medium authenticity, and using the printhead to print onto the print medium in the event that it is authentic.
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