| 摘要 |
An envelope for the transport or storage of documents or securities or valuables has in its walls an electrically conductive network formed from at least one electrically conductive wire, means of closing the envelope also forming means of closing the circuit formed by the electrically conductive network, means of connecting the network to a neutralisation and/or destruction and/or signalling device intended to be placed in the envelope, the density of the network being such that an attempt at opening the envelope by cutting or tearing thereof causes the breaking of the at least one electrically conductive wire and a change in the resistance of the network capable of causing the triggering of the neutralisation and/or destruction and/or signalling device.
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