| 摘要 |
The invention concerns a structure (1) comprising: at least one fibrous material substrate (2), optionally at least one surface layer deposited on one surface of the substrate, a plurality of heterogeneous elements (3) of the substrate and/or of the optional surface layer, dispersed randomly within the substrate and/or the optional surface layer, at least one authenticating and/or identifying information having a relationship with at least one spatial and/or physical feature of part at least of said heterogeneous elements. |
