| 摘要 |
<p>The invention concerns a method for secure sealing of a document, comprising the following steps: providing an envelope with two walls defining the surfaces of the envelope, the latter being globally square or rectangular, having an opening (5) along one edge, and one at least of said walls being transparent at least proximate to an edge (4b; 5a) of the envelope; placing through said opening said document into the envelope; sealing said opening, such that a powdery substance possibly introduced into the envelope cannot escape therefrom, the envelope walls being sufficiently non-porous so that said substance cannot escape from said envelope by passing through it.</p> |
