Abstract: A process for manufacturing a material in sheet form, comprising at least one fibrous layer and a plurality of security and/or decorative elements, the process comprising at least one of the following steps: the security and/or decorative elements are sprayed onto one face of the fibrous layer, which is running along a predetermined direction, especially when the fibrous layer is still wet, so as to form at least one continuous pattern having at least one edge, approximately along the run direction, not entirely parallel to the run direction, and a pattern comprising a succession of separate zones, and security and/or decorative elements of at least two different types and/or having a variable concentration are sprayed onto one face of the fibrous layer, especially when it is still wet.