<p>Anti-copying film (2) for covering documents (1), which for the purpose of protection against copying is opaque in vertical plan view (5) owing to total reflection and appears transparent in a slanting (oblique) direction (6) of view. The film has an irregular saw-toothed structure (3). As a result, it is virtually impossible to produce an identical second film which could be laid down to cancel the effect of the anticopying film (2). <IMAGE></p>
