Well, as it seems I didn't notice there is a second discussion page, so my post got some bit out of touch with the discussion.The opinions are right, it is not a proof per se, the final one, but it makes thinks easier to demonstrate on those reports....
The reason this might be important for some, included me, are legal reasons.I work with printed reports to official legal agencies and, if in some countries processes are more and more digital we work all with printed documents.We have an ageing ald ...
