The invention relates, in particular, to a security document (1) having front (11) and back (10) faces and of which the body (C) at least partially consists of fibres, a security strip (2) being at least partially incorporated into said body (C), said body (C) being impregnated with a de-opacifying agent at least facing a part of said strip (2), characterised by the fact that said strip (2) is partially incorporated into said body (C), such that said strip emerges at a plurality of locations at the surface of said body (C) on said front face (11), thus forming windows (F), two consecutive windows (F) being separated by a bridge (P) corresponding to a region in which the strip (2) is buried in said body (C), and such that said de-opacifying agent also impregnates the body (C) in the areas (3) located to either side of the longitudinal sides of said strip (2), at least facing one region forming a bridge (P).
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