Sheet, method and device for manufacturing a sheet and method and device for identifying a sheet

摘要

A planar sheet comprising, on a first surface of the sheet, at least one printed mark, and on a second surface of the sheet, opposite the first surface, at least one invisible printed mark vertically adjacent to the mark printed on the first surface. In at least one pair of vertically adjacent marks formed on the opposite surfaces, at least one of the marks of the pair has unique content. At least one invisible mark can be a two-dimensional barcode and/or at least one invisible mark can be a copy-protection mark. The content of at least one mark can be representative of the position of an invisible mark on the sheet.

主权项

1. Planar sheet, comprising:
on a first surface of the sheet, at least one printed mark; on a second surface of the sheet, opposite said first surface, at least one invisible printed mark vertically adjacent to the printed mark on said first surface; in at least one pair of vertically adjacent marks formed on said opposite surfaces, at least one of the marks of said pair has unique content; and wherein a content of said printed mark on said first surface is representative of a position of said invisible mark on said second surface of the sheet.