| 摘要 |
An electronic security device has a light-receiving interface (10) that receives a modulated light signal emitted by the screen of a computer making use of the data medium, an output interface (11) adapted to emit output information as a function of the received input information, and an electronic central unit (7) connected to the receive and emit interfaces and adapted to determine the output information as a function of the input information and to cause said output information to be emitted.
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