Further to the cunning plan for a pdf-dwg partnership: This does not allow for the fact that quite often we make use of tabs in a drawing, which leads to the unfortunate case where we might have Layout 1 being issue B and Layout 2 could be issue C.
What then? Well, how about naming such drawings as 1234XB.dwg? The X would indicate that this is a multi-layout drawing and the B would mean that at least one of the layouts was issue B.
This still does not get around the problem of the pdf viewing person knowing if say Layout 1 was up to date or not. A possible solution could be a simple txt file kept in the same directory, named the same as the drawing, for instance 1234X.txt. In this file might be:
The program mentioned in the previous post might access this file and display these contents.
The hard part is, now we have loaded up the poor old draftsman with yet another piece of beaurocracy, the last thing he needs. I have seen somewhere a program (lisp/script) that does do updating of revisions-maybe this might be the method?